How Often Should You Worm Your Horse? (Solved)

1. Each horse should be dewormed every 6 months with an Ivermectin product (Spring and Fall). Ivermectin is a larvicidal (will kill parasite larvae), and if used every 6 months on each horse, large strongyles will be eliminated from your farm.

What is the best worming schedule for horses?

Traditionally horses have been dewormed every two months, but this has led to parasite resistance among horses. For this reason, we recommend performing Fecal Egg Counts (FEG) in the spring (ideally spring and fall) to determine the number of eggs a horse has in its manure.

Can you worm a horse too often?

The active ingredient in a horse wormer kills the sensitive parasites in the population, but those parasites not affected go on to create new generations of resistant parasites. Frequent dosing or under-dosing can cause resistance to occur as can the effectiveness of the wormer.

How often do you deworm horses?

Interval Deworming Timing is important and it is recommended that you deworm every 8 weeks. If you treat too early, the worms may be too immature to be affected by the dewormer. If you treat too late, the worms may have had the opportunity to produce eggs, which will infest your horse’s environment.

What are the signs that a horse has worms?

Symptoms of worm infections in horses

  • Weight loss.
  • Colic.
  • Diarrhea or constipation.
  • Rough hair coat.
  • Poor growth in foals.
  • Respiratory problems. (nasal discharge, cough)

How soon after worming a horse can you worm again?

Many of the data sheets for wormers, notably those that contain praziquantel, ivermectin or moxidectin, advise stabling for two – three days after worming.

What horse wormer kills all worms?

Prominent in this class, ivermectin is effective against adults of all the common equine parasites except tapeworms. It is also effective against some larvae and is credited with greatly reducing colic associated with the migrating larvae of Strongylus spp., but it does not kill encysted small strongyle larvae.

What shots do horses need yearly?

Summary. To recap, your horse should at least receive EWT/WN and Rabies vaccinations once a year. In general, we recommend that your horse receive EWT/WN, PHF/Rabies, Strangles, and Flu/Rhino in the Spring, and PHF and Flu/Rhino in the Fall.

How often should horse teeth be floated?

Your horse should be examined and have a routine dental float at least once a year. Depending on your horse’s age, breed, history, and performance use, we may recommend that they be examined every 6 months.

What is the most common worm in horses?

Small strongyles, also called “small redworms,” include approximately 50 different species and are the most common worms in horses and the main concern in parasite control. They have a worldwide distribution, and most horses are infected with small strongyles or have been infected at some point in their life.

How often should you vaccinate your horse?

Vaccination is recommended for all horses and ponies on an annual basis. A horse with an unknown vaccination status that sustains an injury should receive a dose of tetanus antitoxin along with a dose of tetanus toxoid. A second dose of toxoid should be given 4 wk later.

Can you overdose a horse on Wormer?

3) NEVER overdose your horse. ‘A full tube’ is irresponsible worming as this will cause a potentially untreatable parasite resistance.

How often should a horse’s hooves be trimmed?

Because the horse’s hooves grow slower in the winter, you should trim or shoe hooves every 6 to 12 weeks. This time interval may be different between horses based on their hoof growth.

How do you tell if a horse needs to be dewormed?

Common signs a horse needs worming are weight loss, diarrhea, fatigue, itchy rear-end, and an off-color or unhealthy coat. Here is a list of signs a horse infected with worms may display:

  1. Diarrhea.
  2. Loss of hair around its tail from rubbing.
  3. Not eating normally.
  4. Losing weight.
  5. Lack of energy, sluggish.
  6. Anemia.
  7. Colic.
  8. Impaction.

What happens if you dont worm your horse?

Horses pick up tapeworms during the grazing season, so the autumn is the best time to treat them. An untreated tapeworm burden may cause colic. Egg counts do not detect immature, encysted worm larvae which are not producing eggs.

Can you see worms in horse poop?

You can’t see them because the eggs are too small. But occasionally, you may see internal parasites in the adult or larva form that have worked their way through your horse’s digestive system and into the manure.

How Often Should I Deworm My Horses?

Internal parasites are a normal component of the digestive systems of horses. While certain parasites might be useful in maintaining the health of the intestine, an overabundance of worms can create a broad range of potentially serious difficulties for your horse’s health and wellbeing. Setting up a good deworming regimen can assist to keep horses healthy while also reducing the likelihood of worm infection spreading.

How Horses Get Worms

A natural component of the digestive systems of horses is the presence of internal parasites. While certain parasites might be useful in maintaining the health of the stomach, an overabundance of worms can create a broad range of potentially hazardous complications for your horse’s digestive system. The establishment of a regular deworming program can assist in maintaining the health of horses and reducing the likelihood of worm infection spreading among them.

  • Increased appetite
  • Weight loss that occurs suddenly
  • A dull or out of condition coat
  • Lethargy
  • Anemia
  • Diarrheal obstruction
  • Intestinal blockage.

In extreme circumstances, symptoms might increase to the point where they are potentially lethal. Veterinary diagnosis is recommended if you believe your horse has worms. This will help you discover the particular type of worms implicated as well as the degree of contamination, which will help you develop an appropriate treatment strategy. To check for worms, a veterinarian will do a fecal examination or a blood test on the animal.

How Often to Deworm Your Horse

Severe occurrences might result in symptoms worsening and even death. Veterinary diagnosis is recommended if you believe your horse has worms. This will allow you to assess the type of worms implicated as well as the degree of contamination, which will allow you to arrange an appropriate treatment. An examination of the stool and/or a blood test will be performed by a veterinarian to check for worms.

  • As a result, animals that are extremely young or very elderly may require more frequent deworming since their internal barrier to contamination is more vulnerable
  • Optimal health: Horses in good overall condition may require fewer deworming treatments because they are better equipped to withstand the harmful effects of worms. Smaller herds may require less deworming than larger herds, which may unwittingly contaminate one another. Herd size is also important to consider. Poor Pasture Conditions: A filthy, tiny pasture is more likely to house higher populations of worms than a larger field that has been appropriately treated to reduce parasites. Pasture Management: Climate: Worms grow in warm, damp conditions, therefore horses in cooler, drier climates are less likely to require deworming on a regular basis. When Your Horse Comes into Touch with Unknown Horses: If your horse comes into contact with strange horses at shows or boarding facilities, more regular deworming treatments may be necessary.

Keeping Your Horse Worm-Free

Additionally, it is critical to create a regular deworming regimen for your horse and to take easy precautions to reduce the risk of worm infestation. This will allow you to use deworming treatments less regularly, which will prevent the parasites from becoming resistant to the deworming treatments in the future. In order to keep your horse free of worms.

  • Maintain a regular harrowing schedule in the pasture to break up manure and enable it to dry out, killing any worms or larvae that may be present. Mow the pasture frequently to expose the dung and worms to more direct sunlight and drier circumstances that are less conducive to worm growth and reproduction. Ensure that manure is dumped in a location that is separate from where your horse will feed or graze in order to reduce the possibility of contamination. If feasible, rotate pastures every few weeks, allowing each pasture to remain unused for 6-8 weeks before returning horses to the herd. Reduce the number of horses in each field at the same time to reduce waste and cross-contamination between animals. Elevated feeders should be used to prevent your horse’s feed from coming into touch with the ground or any surrounding dung, which might lead to contamination.

It is simple to maintain control over these troublesome parasites and to keep your horses healthy throughout the year by developing a deworming regimen that matches your animals’ needs and taking precautions to keep them worm-free.

How often should I worm my horse?

Generally speaking, worming should be done every 6-8 weeks. The development of a sustainable worming program for your own property, on the other hand, is quite vital. The health of your horses will be protected if you use effective worm control in conjunction with pasture management. Every animal, including horses, is infected with parasites. When properly maintained, your horse may coexist with worms in a rather peaceful environment. However, if worm loads are not well controlled, they can cause health issues such as colic, diarrhoea, and weight loss.

  1. A faecal egg count reduction test is the most accurate method of determining how frequently you should worm your cattle (FECRT).
  2. It is possible to use an FECRT to not only determine which worms are present in your horses, but also to determine which wormers will be most successful.
  3. To combat worm resistance, you should concentrate your efforts on the most serious parasite risks and make certain that you dose appropriately.
  4. Once you’ve identified which wormers are the most efficient for your property, you must apply the dosage in accordance with your weight.
  5. Worm Preventative Measures To conclude, there are other methods you may take, in addition to worming, to limit the worm population on your property.
  6. Aside from that, resting paddocks during hot, dry weather may keep your horses safe from worms, which flourish in these conditions.

The practice of quarantining new arrivals and performing an FECRT on them can also help to limit the spread of new worm species among your animals. Do you want to find out more about the health of your horse? To get our free fortnightly educational reports, please click here to subscribe.

Equine Deworming Schedule

Not many people are aware that horses have a low number of parasites in their digestive tracts all of the time, and that this is quite normal. The objective of parasite control in horses is to maintain a healthy balance in the number of parasites present so that we do not experience clinical signs (weight loss, colic), while at the same time avoiding the development of drug resistance. Horses have traditionally been dewormed every two months, however this has resulted in parasite resistance among horses as a result of the practice.

Red Hills Veterinary Hospital Recommends the Following Paste Deworming Protocol:

Unless otherwise stated, all egg count levels listed below are recommendations based on the average range of counts achieved using the McMaster procedure.


Prior to deworming in the spring, a fecal egg count is conducted (ideally spring and fall)

  • Ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®), moxidectin (Quest®)
  • SPRING (March) – ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®)
  • PREVENTION: Ivermectin with praziquantel (Equimax®, Zimectrin Gold®) or moxidectin with praziquantel (Quest Plus®) in the FALL (October).


Ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®), moxidectin (Quest®); SPRING (March) – ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®); The following medications are recommended for the fall (October): ivermectin with praziquantel (Equimax®, Zimectrin Gold®), or moxifloxacin with praziquantel (Quest Plus®).

  • In the spring (March), use ivermectin (such as Equell®, Zimectrin®, Rotectin®, IverCare®, and other brands), or moxidectin (such as Quest®)
  • In the late summer (July), use ivermectin
  • In the fall (October), use ivermectin w/praziquantel (such as Equimax®, Zimectrin Gold


Pre-deworming fecal egg counts are conducted before to deworming in the spring and fall to detect signs of resistance.

  • Ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®), moxidectin (Quest®)
  • SPRING (March) – ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®)
  • Ivermectin is used in the summer (June)
  • Ivermectin with praziquantel is used in the early fall (September) (Equimax®, Zimectrin Gold®)
  • Moxidectin is used in the late fall (November).

In general, fecal egg counts should be used to assess therapy effectiveness. Unless otherwise specified, the treatment recommendations provided below are broad suggestions based on current medication resistance discoveries from throughout the world. It’s possible that other forms of dewormers will still be useful on your farm, and you can use them if you’ve determined that they’re successful through a fecal egg count reduction test.


  • Fenbendazole (Panacur) or oxibendazole (Anthelcide) for children under 2 months of age
  • Four to five months — Fecal egg count to track the incidence of ascarids vs strongyles in the stool. Fenbendazole (Panacur) or oxibendazole (Anthelcide) should be used to treat ascarid infestations. Strongyles should be treated with ivermectin after roughly 5 months. Use ivermectin and praziquantel to treat a tick infestation before the end of the calendar year. Assessing for the presence of ascarids in short yearling feces and treating those found with fenbendazole or oxibendazole should be done as soon as possible. Strongyles should be treated roughly three times with ivermectin throughout the yearling year, followed by one treatment with moxidectin + praziquantel towards the conclusion of the grazing season. Assays to determine treatment effectiveness include fecal egg count reduction tests.

How often do you de-worm your horses?

THere have been several new research and improvements in wormers, and as a result, the previous methods have been discovered to either not perform as effectively or to be a waste of your money. I’ve saved a number of articles on deworming, and I’ll provide you with one and two links to further papers on the subject. Please take the time to read it since I believe it will be of assistance. =D Parasites Keeping your horses free of parasites is critical to their health and wellbeing. To identify whether or not parasites are present, do the appropriate fecal tests.

Bots and tapeworms should be treated at least once a year.

Dose according to weight and consult with your veterinarian if you have any doubts.

  • Expansion of the stomach or the appearance of a pregnant abdomen
  • Dull coat
  • Delayed or atypical shed
  • Low energy level
  • Depressed demeanor Growth and development that is abnormal
  • Coughing that is not explained and indicators of a reduced immune system Problems with weight control
  • Constipation and/or diarrhea
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Paste Dewormers are classified according to their chemical composition. Active IngredientsProducts that work against (different types of worms) (Brands) The insecticide Ivermectin is used to treat large and small strongyles, pinworms, hairworms, and threadworms as well as stomach worms, lungworms, ascarids (roundworms), and bots. Jeffers Ivermectin Horse Well-Being Strongyles, pinworms, hairworms, stomach worms, ascarids, bots, and Encysted little strongyles are all treated with IvermectinBimectinTMZimecterin®Equimectrin®Rotectin 1.87 percent Iver Ease TMIverCare® MoxidectinLarge and small strongyles, pinworms, hairworms, stomach worms, ascarid Ivermectin and Praziquantel (Quest®Ivermectin & Praziquantel) for the treatment of large and small strongyles as well as pinworms, hairworms and threadworms as well as stomach worms, lungworms, Ascarids, Bots, and Tapeworms The use of EquiMax®Zimecterin Gold®Moxidectin and Praziquantel against large and small strongyles, pinworms, hairworms, stomach worms, Ascarids, Bots, Encysted tiny strongyles, and Tapeworms is recommended by the American Veterinary Medical Association.

Quest® PlusPryantel pamoate is a prescription medication.

Pyrantel Tartrates, Anthelcide®EQ, Large and Small Strongyles, Ascarids and Pinworms, Daily Wormers, Anthelcide®EQ Strongid® C,ContinuexTM, and Equi Aid CW® are among the dewormers being used to combat dewormer resistance, according to The Threat of the Tapeworm –

13 guidelines to follow when deworming horses

Equine practitioners are particularly concerned with the control of internal parasites in their patients. The availability of readily available, easily administered, and effective deworming agents, combined with the recognition that a specific parasite, S. vulgaris, can cause a destructive colic problem (verminous arteritis), has resulted in a deworming frenzy, particularly among horse owners and breeders of horses. Parasite resistance, which has developed in part as a result of the frequent deworming, has become a big concern.

  • Because of prior deworming procedures, parasites that were formerly a major source of worry, such as S.
  • With adult horses, the focus is currently on small strongyles (cyathostomins), with tapeworms and other parasites thrown in for good measure.
  • At this time, it is recommended that horses should only be treated if they exhibit indications of a high parasite load.
  • Due to the fact that horses with a high degree of immunity do not shed many eggs, deworming all horses on the same timetable is not a good idea.
  • Internal parasites are not efficiently controlled by deworming every couple of months, switching dewormers each time, or deworming every other year, among other methods.
  • While it was originally the objective to completely eliminate all parasites from a single horse, this is now unachievable.
  • Some general guidelines are as follows: 1.Horses, particularly those older than three years old, should be handled as individuals rather than as part of a herd or as part of a routine.

If the horse lives alone or in a stable, the frequency of the visits may be reduced or eliminated altogether.

Acaricides such as pyrantel, fenbendazole, and oxibendazole are effective in the treatment of ascarids in young horses.

3.In herd circumstances, fecal egg counts should be utilized to choose moderate and high egg shedders for deworming, with moderate and high egg shedders being selected first.

Not all horses must be tested in order to be qualified.

4.Large shedders very definitely require more than one or two treatments each year, depending on their size.

The administration of any subsequent therapies would be done on an as-needed basis.

deworm at the proper time of year Deworming should be avoided during severe temperatures such as winter or summer, as well as during droughts.

Worm-control efforts should be considered as an annual cycle that begins when the likelihood of worm transmission to horses increases from minimal to likely.

If the time between dewormings is too short, the findings of the fecal egg count will only reflect how effectively the last dewormer performed, rather than measuring how well the horse’s immune system lowered levels of cyathostomin egg shedding during that period. As an illustration:

  • After receiving moxidectin, you must wait at least 16 weeks before collecting a fecal sample. After using ivermectin, you should wait at least 12 weeks before collecting a fecal sample. Wait at least nine weeks after using benzimidazoles (fenbendazole/oxibendazole or pyrantel) before collecting a fecal sample.

The deworming of stabled horses that do not have access to other equids on pasture may only be necessary on a rare occasion or not at all. 9.When compared to older horses, horses less than three years of age are more susceptible to parasite infestations than older horses. Among the particular recommendations for children are:

  • Foals should get at least four deworming treatments throughout their first year of life. The first should be performed when the baby is two or three months old, and the second should be performed three months later. Check for parasite eggs before weaning to determine whether or not the foal has parasites
  • The third and fourth treatments should be considered when the child is nine and twelve months old, respectively, and should target the worms that have been discovered. It is recommended that tapeworm therapy be included in one of the latter treatments. Perform fecal testing on a yearly basis to see how effectively the dewormers are working. It is not recommended to deworm an 8-day-old foal. Worms are not the source of the diarrhea. Recent weaned foals should be sent out on the cleanest pastures. In the case of yearlings and 2-year-olds, they should be treated as high shedders and should have three to four yearly treatments with medications that have been proven to work by a fecal examination.

Deworming should be performed on horses displaying indications of parasitism using either moxidectin, which has shown no evidence of parasite resistance, or a larvicidal regimen of fenbendazole (10 mg/kg for five consecutive days) if possible. Do not rely on dewormers alone to keep your pets healthy. Controlling the environment is essential. Manure should be removed from the pasture rather than being spread there. If there are cattle or goats available, allowing them to rotate onto the horse pastures for a few weeks will aid in the removal of eggs from the pastures.

  1. Tradition dictates that botox therapy be administered 30 days after the first frost occurs.
  2. Diatomaceous earth and other alternate dewormers are not recommended.
  3. There is no single deworming program that works for everyone.
  4. More information may be found on the website of the American Association of Equine Practitioners, which also has recommendations.
  5. Did you find this article to be interesting?

Horse Worming Programmes

Horse worming programs that are tailored to the individual horse guarantee that specific worms are targeted with an effective treatment at the appropriate time. The following are the four major kinds of anthelmintics (horse wormers) available: 1.Benzimidazoles, such as fenbendazole and mebendazole, among others. 2.Tetrahydropyrimidines, such as pyrantel embonate (pyrantel embonate), 3.Macrocyclic lactones, such as ivermectins and avermectins, among others. Wormers based on the drug praziquantel (tapeworm treatment ONLY) Worming continuously throughout the year The importance of testing for and treating encysted small redworm in horses during the winter months cannot be overstated.

For this purpose, fenbendazole or moxidectin-based wormers can be employed, with the former being the preferred choice.

Spring and fall are the best times to perform this task, and either praziquantel or a pyrantel-based wormer should be used.

Your veterinarian or prescriber will be able to provide you with more information about this.

It is crucial to remember, however, that faecal egg counts are incapable of detecting encysted tiny redworm or tapeworm eggs, and that it is thus necessary to treat for these parasites at specific times of the year, as previously explained.

Worming a New Horse

A worming treatment or combination of products that will kill all forms and stages of roundworm (including encysted and inhibited tiny redworm) and tapeworm is recommended for each new horse that is brought into the household. If you worm your horse, you should keep him stable for 48 hours thereafter so that the wormer can take action and prevent viable eggs from being laid on the pasture.

When to Deworm your Horse – QUEST® and QUEST® PLUS

WHEN SHOULD YOUR HORSE BE DEWORMED? Every horse is a one-of-a-kind individual. Collaborate with your veterinarian to establish an Individualized Deworming TMprogram for your horse, which should begin with an examination of the fecal egg count (FEC). Establish a baseline fecal egg count for comparison purposes. An FEC test will establish the degree of parasite shedding that is currently present in your horse. The results of the FEC test reflect the number of parasite eggs in one gram. It is possible that less than 200 eggs per gram indicates a minimal danger.

Understand the risk factors associated with parasites in your horse.

These should be discussed with the veterinarian on your team.

  • Results of the FEC test
  • Horse’s age
  • Local climate
  • Manure removal
  • Pasture rotation
  • Pasture population
  • And more. Lush, overgrown, dry lot or a mix of these types of grassland
  • Feeding can be done individually or in groups, on or off the ground. Show/performance, recreation, and companionship are some of the ways horses are used. horses are moved throughout the property on a daily basis

Deworming Your Horse Should Be Individualized Following an evaluation of FEC shedding levels and your horse’s individual risk profile, you and your veterinarian will be able to build an Individualized Deworming regimen for your horse to meet his or her needs. Deworming treatments, which target important equine parasites of concern, are recommended by the American Association of Equine Practitioners (AAEP) for all horses in the spring and autumn, according to their guidelines. 1 The American Association of Equine Practitioners (AAEP) recommends high-risk deworming treatment strategies for young horses (ages 3 and younger).

  • QUEST ® is a single-dose treatment that efficiently cures and controls encysted tiny strongyles.
  • 2,*Autumn DEWORMING —Tapeworm therapy is advised once a year, in the late fall or early winter, when tapeworm transmission has ceased as a result of the winter’s chill.
  • It is possible that these two treatments are all that is required depending on your horse’s parasite risk factors.
  • Consult with your veterinarian to have a fecal egg count (FEC) test performed on your horse prior to purchasing a deworming medication.

Use of QUEST Gel or QUEST PLUS Gel in foals younger than 6 months of age, as well as in ill, debilitated, and underweight horses, is not recommended. It is not recommended for usage in other animal species due to the possibility of serious adverse responses, including deaths in dogs.

Choose The Correct Worming Horse Strategy

A variety of factors influence how worming treatments for horses are administered. Learn how to select the most appropriate worming regimen for your horse. Intervals between worming The frequency with which horses are wormed is determined by the management structure in place at the farm. It is preferable to utilize the smallest number of treatments feasible in a year, as over-worming might result in resistance to treatment. Some horse owners will need to worm their horses more frequently than others, depending on a variety of variables.

  • This is due to the fact that these horses will be the most susceptible to infection.
  • In areas with low stocking levels, it may be possible to worm horses on a less frequent basis.
  • Using faecal egg counts to identify adult horses for deworming is the most environmentally friendly technique to manage worming in your herd of adult horses.
  • Gold Standard in Strategic Planning Worming horses entails worming them according to the following criteria:
  • The lifetime of a parasite
  • The risk of sickness
  • And the likely resistance status of worms

It is critical to do so in order to slow down resistance. A excellent program is as follows:

  • It focuses on the horses who are most in need of therapy while simultaneously reducing the use of chemicals in the remaining horses. Monitoring of the feces egg count is employed. Prevents the overuse of compounds from the same class of active ingredients. Includes products containing pyrantel to provide appropriate control of tiny strongyles or roundworms that are resistant to other chemicals. It is recommended that moxidectin be used no more than once a year when treating encysted tiny strongyles is explicitly suggested
  • Horses are treated in a strategic manner based on worm lifecycles and the time of year
  • Use of single active wormers year after year is discouraged. It entails quarantining and treating new horses with a combination wormer when they arrive.

For the Gold Standard Young horses program

  • Paddock management can help to reduce worm infestations. Worm the mare two weeks before foaling (or on the day of foaling if the mare is not wormed)
  • In all horses less than two years of age, avoid the use of plain mectin or mectin/tapewormer products. Ensure that you only use combination wormers that contain pyrantel, such asSTRATEGY-T ® andEQUIMAX ®ELEVATION. Make use ofSTRATEGY-Tas as the initial wormer for the foal at 8–12 weeks of age, then repeat every 8–12 weeks until the foal is 9–12 months old before usingEQUIMAX ELEVATION. Incorporate an FEC monitoring protocol within the breeding program for yearlings.

For the Gold Standard Adult horses program

  • Paddock management can help to reduce worm infestations. Worm all adult horses twice a year: once in the spring with STRATEGY-T and once in the autumn with EQUIMAX ® or EQUIMAX ELEVATION. To determine whether horses or paddocks require worming at other times of the year, use FEC monitoring to identify them. Make use ofSTRATEGY-T during the warmest months* and EQUIMAX during the cooler months. FEC testing may be used to detect any excessive shedders in your herd of horses. Each of these horses is wormed four to six times a year.

If your horse gets summer sores that appear to be suspicious, useEQUIMAXorRAZOR ®and then return toSTRATEGY-T if more summer worming is necessary. Vote for the following content: 54321 Looking for more information about horse health?

Is it time to deworm your horse?

“When should I worm my horses?” “How often should I worm a horse?” and “Which dewormers are most effective against which parasites?” are all frequently asked questions, but in order to adequately answer them, we must first understand how horses get worms, what signs to look for in your horse, and how worms affect your horse. How can a horse become infected with worms? Horses are more likely to get worms if they are turned out with other horses who have been affected or if they are turned out in a polluted pasture.

  1. Pastures become polluted with the eggs and larvae of parasitic worms or parasitic worms by the dung of an affected horse, which combines with the grass of the pasture and spreads the parasites.
  2. Because a pasture might remain contaminated for an extended period of time, it is important to continually keep this concern in mind.
  3. Infected horses can still be in good health despite the fact that they look to be healthy on the outside.
  4. This will identify the kind of parasite and will assist you in determining which dewormer will be the most successful for your horse’s particular situation.
  5. There are four forms of internal parasites that are commonly encountered: Strongyles, Roundworms, Tapeworms, and Bots.
  6. Strongyles (blood or red worms)– Strongyles vulgaris, S.
  7. equinus are three species of strongyles that may be detected.
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Because of the damage caused by S.

The S.

equinus are aggressive blood feeders that can cause anemia, weakness, emaciation, and diarrhea in humans and other animals alike.

When the worm matures and reproduces in the small intestine, it returns to the colon.

An infestation of a minor size will almost certainly have no effect on the horse’s health; but, a large infestation can cause weight loss, hinder the growth of young horses, produce a rough hair coat and/or pot-bellied look, as well as lethargy and colic.

Forage mites in the grass feed on tapeworm eggs, which hatch and grow into tapeworm larvae within the mites.

Now that the larvae have established themselves in the horse’s digestive tract, they can grow and mature.

– Bots– Adult flies attach themselves on the horse’s forelegs, chest, and shoulders, laying yellow-colored eggs.

Following ingestion, the larvae migrate through the stomach and attach themselves to the lining of the stomach, causing discomfort, digestive difficulties, and blockage.

In the spring, they emerge from the earth as adult flies and begin the cycle all over again.

When should a horse be wormed and how often?

But there is a heated discussion regarding whether or not it is effective to use the same wormers on a regular basis.

Here is a chart that you may use to ensure that your horse is dewormed on a regular basis and at the appropriate periods. * In order to determine an appropriate wormer schedule, please consult your veterinarian. Now is the time to shop:

Equine Recommended Deworming Schedule

Obtainable as a printable resource Unless otherwise stated, the egg count levels provided here are only recommendations based on the average range of counts achieved by the McMaster procedure.

Adult Horse Schedule

  • Resource that can be printed All of the egg count criteria shown here are recommended guidelines based on the range of counts normally obtained using the McMaster procedure and are subject to change without notice.

Moderate Shedders (200-500 EPG)

  • Performing a fecal egg count before to deworming in the spring (preferably, both spring and fall)
  • The use of ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare, and other brands), as well as the use of moxidectin (Quest®), is recommended in the spring (March). Late summer (July) – ivermectin
  • Fall (October) – ivermectin w/ praziquantel (Equimax®, Zimectrin Gold®) or moxidectin with praziquantel (Quest Plus®)
  • Winter (November) – ivermectin w/ praziquantel (Equimax®, Zimectrin Gold®)
  • Spring (April

High Shedders (500 EPG)

  • In the spring and fall, a fecal egg count is conducted prior to deworming to check for signs of resistance. The following medications are used in the spring: ivermectin (Equell®, Zimectrin®, Rotectin®, IverCare®), moxidectin (Quest®)
  • The following medications are used in the summer: ivermectin
  • The following medications are used in the late fall: ivermectin with praziquantel (Equimax®, Zimectrin Gold®)
  • The following medications are used

In general, fecal egg counts should be used to assess therapy effectiveness. Unless otherwise specified, the treatment recommendations provided below are broad suggestions based on current medication resistance discoveries from throughout the world. It’s possible that other forms of dewormers will still be useful on your farm, and you can use them if you’ve determined that they’re successful through a fecal egg count reduction test.

Foal Schedule

  • Fenbendazole (Panacur) or oxibendazole (Anthelcide) for children under two months of age
  • Four to five months — Fecal egg count to track the incidence of ascarids vs strongyles in the stool. Fenbendazole (Panacur) or oxibendazole (Anthelcide) should be used to treat ascarid infestations. Strongyles should be treated with ivermectin after roughly five months. Use ivermectin and praziquantel to treat a tick infestation before the end of the calendar year. Assessing for the presence of ascarids in short yearling feces and treating those found with fenbendazole or oxibendazole should be done as soon as possible. Strongyles should be treated roughly three times with ivermectin throughout the yearling year, followed by one treatment with moxidectin with praziquantel before the conclusion of the grazing season, according to the manufacturer. Assays to determine treatment effectiveness include fecal egg count reduction tests.

Deworming Protocol Guidelines

The following are some of the most essential points and recommendations:

  • Maintain pasture rotation
  • Cross-graze grasslands with ruminants wherever possible. Remove manure on a regular basis. During hot and dry weather, harrow or drag pastures and keep horses out for two months. Overstocking pastures should be avoided.
  • Fecal analysis should be performed at least once a year to assess the effectiveness of parasite management.
  • Fecal egg count is an estimation of the amount of parasite eggs released by the horse in his feces. Before doing a fecal analysis, consult with your veterinarian to ensure that enough time has gone since your horse’s last deworming for eggs to have re-appeared in the stool. Each dewormer has a different Egg Reappearance Period, so check with your doctor to find out what yours is. Fecal egg count reduction test—depending on the product used, the number of worm eggs in the feces should reduce by 90 percent when evaluated 14 days after deworming.
  1. Once a year, use a dewormer containing praziquantel (such as Zimectrin Gold® or Quest Plus®) to treat for tapeworms. Small strongyles (cyathostomes) are only sensitive to a few different types of dewormers while they are in their encysted larval stage. In light of medication resistance studies throughout the world, moxidectin (Quest) would be the medicine of choice in the vast majority of instances. Enthusiastically treating the encysted larvae is suggested in the fall, at or at the conclusion of the grazing season, just before the animals enter the winter. Don’t keep mares and foals in the same pasture or paddock year after year to save money. There is an increase in the number of ascarid eggs produced, which might survive between years and infect fresh foals born during the spring breeding season

To be clear, the two parasites that cause the most worry in adult horses are tiny strongyles (encysted strongyles, cyathostomes) and tapeworms (see below). The ascarid is the parasite that causes the most worry in young horses. For the best results, consult with your veterinarian and do fecal egg counts to determine: 1) dewormer efficacy in your equine business, 2) the existence of ascarids in young horses, and 3) the presence of weakyle egg shedders at low, medium, and high levels in adult horses.

TheEquine Servicessection was responsible for its creation.

Martin Nielsen was in charge of editing.

Managing your horse after worming

We get a lot of questions from customers who are concerned about what to do with their horses after they have been wormed here at Westgate Labs. Put them in a safe place, but for how long? Do you want to put them back in the same field? Or do you relocate them immediately to clean, fresh grazing? The chosen course of action may surprise you because there are a few factors to consider. Managing horses with care after worming serves two purposes: first, to optimize parasite management for your horse and to help slow down wormer resistance; second, to reduce the impact of harsh chemicals in the environment on your horse’s health.

  1. They will also have a deleterious impact on dung beetles and other microbes, as will all worming drugs.
  2. Packaging should be disposed of with care, ideally in a trash can with a cover.
  3. Within the next 24-48 hours Many of the data sheets for wormers, particularly those containing praziquantel, ivermectin, or moxidectin, recommend keeping animals in a stable for two to three days following worming.
  4. “This is done to limit the impact of moxidectin on dung fauna and because there is insufficient data regarding the environmental risk of praziquantel,” the data sheet states.
  5. If stabling is not an option, try to worm when the weather is dry to prevent chemicals from being washed into the soil, and poo pick as completely as you can after each horse.
  6. Any worms that are shed after worming are unable to live outside of the body and thus pose no concern of reinfection to horses grazing in the pasture.
  7. It is currently believed that relocating the horse to a clean pasture immediately following worming is an effective method of encouraging the establishment of a resistant worm population in the horse.

To prevent this from happening, horses should be returned to their old pasture after being wormed, therefore diluting the population of resistant worms with those that are still sensitive to the treatment.

Tapeworms are being targeted.

In part, this is because the tapeworm segments that are shed after treatment include eggs, and these eggs rupture in the dung, unleashing new potential for infection, which you do not want on the pasture if at all possible.

Management that is effective The goal should be to administer as few wormers as feasible to our horses.

Instead of depending on frequent chemical intervention, try to interrupt the worms’ lifecycle using mechanical techniques such as poo picking, cross grazing, or harrowing (in dry, sunny weather).

Learn more about dung beetles and how to protect yourself against them.

Do you have any queries regarding worming your horse? Contact us now. We understand that there are instances when you want assistance with a subject. Whenever you need it, you may get FREE friendly SQP help from our team, which is available via phone, email, or Facebook message.

Deworming your horse

  • Deworming is an important part of every horse and foal health care regimen. According to some research, parasites are responsible for 80 percent of colic occurrences, with larval strongyles being the most common cause of colic in adult horses. With the exception of tapeworms and bots, fecal samples can be used to screen for internal parasites.


Roundworms (Parascarus equorum) are most commonly found in horses between the ages of 3 and 9 months. Eggs in the horse’s feces might be discovered by a veterinarian or diagnostic laboratory. Symptoms of roundworms in foals include:

  • A decrease in appetite
  • A slowing of the rate of growth
  • Potbelly look due to a dull, dry hair coat.


To kill mature roundworms, use pyrantel pamoate or fenbendazole as a treatment. If there is a suspicion of a significant burden, fenbendazole will perform better. In order to destroy the larval stages of the worm, ivermectin or piperazine should be used.

Large strongyles

Strongylus vulgaris, a big strongyle that infects the cecum and ventral colon, is present (large intestine). Large strongyles can be detected using fecal flotation assays. It is possible for the horse to become clinically ill when huge numbers of larvae infiltrate the gut. Signs of illness caused by huge strongyles include:

  • Fever, diarrhea, lack of appetite, weight loss, colic, and death if left untreated are all possible outcomes.

When a child has a persistent infection, random, recurring colic is a significant symptom of illness.


In the case of chronic illnesses, random and recurring colic is a significant indicator of disease progression.

Small strongyles

Little strongyles (Cyathostome) develop in the lining of the cecum and colon, causing small growths to appear. As they emerge, they cause damage to the lining of the stomach and swelling, which can impair digestion and the absorption of nutrients. Small strongyles can be detected using fecal flotations. Symptoms of tiny strongyles include:

  • If left untreated, anorexia, weight loss, diarrhea, and colic might result, as can becoming very underweight.


Adult worms can be treated with ivermectin, oxibendazole, pyrantel pamoate, or piperazine, among other medications. To cure larvae, you can use ivermectin, moxidectin, or pyrantel tartrate, among other things.


In humans, tapeworms (Anoplocephala perfoliata) may be found in the large colon and near the end of the small intestine. Tapeworms can be seen in horses older than 6 weeks of age. It is possible to find tapeworm fragments in the horse’s feces. It is possible that a fecal test will not find tapeworm segments or eggs since horses do not consistently excrete them in their dung. If you live in Minnesota, the rate of tapeworms in horses is the greatest, so make sure to include treatments that target the tapeworm in your deworming regimen.

However, tapeworms can induce the following symptoms:


When treating against tapeworms, double the usual dose of pyrantel pamoate is recommended.

Stomach bots

Horses infected with stomach bots (Gasterophilus) frequently exhibit no signs of illness. Bacterial infections of the mouth, esophagus, and stomach might result in the horse becoming unable to feed.


After the first heavy frost, treat with ivermectin or moxidectin to prevent stomach bots from developing.


Pinworms (Oxyuris equi) are a parasite that may afflict horses of all ages. Pinworms can be identified by looking for eggs in the anal discharge or by “capturing” the worm with scotch tape and observing how it moves. Pinworm symptoms include:

  • Anal irritation, restlessness, poor eating habits, and yellow/gray discharge from the anus are all possible symptoms.


Adult pinworms can be treated with fenbendazole, oxibendazole, pyrantel pamoate, piperazine, or ivermectin, among other medications.

Fenbendazole can be used to treat pinworms in foals.


Threadworms (Strongyloides westeri) are most commonly found in young foals between the ages of 10 days and 6 months. Threadworms can be detected by fecal flotation. Threadworms infect the small intestine and cause swelling and damage to the lining of the small intestine. This has the potential to impede digestion and nutritional absorption. Symptoms of threadworms include:

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Threadworms are transmitted to foals through the mare’s milk. Infection can be reduced if the mare is treated with ivermectin within one week after giving birth. If you suspect threadworm in a foal, treat him with oxibendazole or ivermectin immediately. When choosing a dewormer, it is important to understand which parasite groups each active component targets (Table 1.). Some veterinarians have discontinued the use of moxidectin because of rare but serious side effects.

Table 1. Deworming products and parasites they control

This technique entails determining the overall number of parasites present in each animals through testing.

  • Fecal egg counts should be conducted once a month according to standard practice. Tapeworm testing should be performed twice a year, either by fecal testing or blood testing (serology). The treatment of all animals that test positive over a specified threshold level is recommended. Botfly larvae (bots) should be treated once a year, and this should be done during the winter months.

It is only acceptable for mature horses to participate in this program, and it should only be considered on a farm with a dedicated manager and sound grazing management practices.

Strategic dosing

This technique entails treating all pastured animals with a suitable product on a regular basis at intervals determined by the producer.

  • This technique entails administering an appropriate substance to all pastured animals at regular intervals.

Interval dosing

This is the method that is most frequently employed. It is comparable to the concept of strategic dosage.

  • Animals are treated at regular periods throughout the year. Given that parasite kill time varies from product to product and even from farm to farm, the interval between doses should be decided by the ERP or by guidelines established by your veterinarian based on the products utilized. Farms where there are frequent new recruits to the group, more informally managed (hobby) farms, and young animals are also good candidates for this treatment.

Daily deworming

The addition of a parasite control medicine to the horse’s daily feed is the goal of this technique.

  • Suitable for the majority of mature grazing horses
  • A low amount of the medicine is constantly present in the environment of the parasite, increasing the likelihood that they may develop resistance over time. In most cases, further deworming with various treatments is required on a regular basis. Inquire with your veterinarian about the most recent guidelines.

How often should I deworm my horse?

Fecal egg counts can assist you in determining whether or not your horse need deworming. If your horse is losing a significant number of eggs, you can deworm them for the specific parasite(s) that are causing the problem. In an ideal situation, you’ll discover a happy medium where you can control the parasites but not excessively deworming. Excessive deworming can encourage the development of parasites that are resistant to deworming. The majority of farms provide a double dosage of pyrantel or a praziquantel medication once a year to control tapeworms.

When should I deworm mares and foals?

After foaling, deworm mares to limit the risk of Strongyloides being passed to the foal through the milk. Begin a deworming regimen for foals before to weaning (about 2 months of age). Roundworms should be targeted in this approach.

How else can I manage parasites?

Parasite control strategies must include the use of dewormers, but management is also important in the prevention and control of parasites. The management strategies outlined here can help you enhance parasite control on your farm.

  • In order to prevent severely infected animals from shedding parasites into the environment and infecting other horses, it is necessary to isolate and treat new animals on the farm. Another option is to demand deworming of all incoming animals when they first arrive at a boarding facility. Young horses should be closely monitored since they are more susceptible to parasite illnesses. Try to avoid eating from the ground, especially in filthy locations and box stalls
  • Routinely pick or pull dung from pastures, and mow pastures on a regular basis. As a result of drying, sunshine exposure, or freezing, this will break up manure mounds while also destroying eggs and parasite larvae. If grazing is the major source of fodder for your horse, ensure sure the animals are not overcrowded and the pasture is not overgrazed. Each 1,000-pound horse requires two acres of pasture, according to a widely accepted standard. Grazing on a rotational basis will assist to limit parasite exposure in the following ways:
  • Extending the use of manure
  • Allowing manure to break down
  • And reducing overgrazing.

How can I tell if my parasite control program is working?

Sending in fecal samples on a yearly basis will assist you in monitoring parasite burdens in your horse as well as the efficiency of dewormers. You can also determine whether or not your horse is a heavy egg shedder or whether or not the parasites are resistant to treatment. It is vital to monitor the efficiency of a parasite prevention program. At the very least, you should check your fecal egg counts once a year. In addition, testing and monitoring will aid in the detection of atypical parasite infection.

As a committed horse owner or stable/farm manager, you and your veterinarian may work together to establish a comprehensive and cost-effective parasite management program that is tailored to your farm and its animals’ specific needs and requirements.

Jeremy D. Frederick, DVM, previously of the University of Minnesota, and Julie Wilson, DVM, also formerly of the University of Minnesota, are the authors of this paper. In 2021, the situation will be reviewed.

Do I really need to worm my horse?

You may keep track of your horse’s parasite load and dewormer effectiveness by sending in fecal samples on an annual basis. If your horse is an egg shedder, you can find out if the parasites are resistant to treatment as well. It is vital to evaluate the efficiency of a parasite prevention program. Tests should be performed at least once each year to determine the number of eggs in fecal fluid. Unusual parasite infections can be detected by testing and surveillance. Sometimes, typical parasite-killing tactics will not be effective against some parasites, and extra treatment will be required.

You will be rewarded for your efforts when your horses’ health, happiness, and production improve.

Frederick (previously of the University of Minnesota) and Julie Wilson (formerly of the University of Minnesota) created this report.

  1. Cyathostomes. What was it about the cyathostome that ensured he got all he wanted? Due to the fact that he was soencystant. Please excuse my terrible jokes
  2. It has been a hard day. Cyathostomes, also known as little encysted redworms, are a species of nematode, or round worm, that lives in the soil. After spending time in the horse’s big intestine, the adults generate eggs that are excreted into their pastures
  3. The eggs hatch, and the larvae are consumed by the horse. Aside from that, it is the larvae that have the ability to encyst (hide) within the walls of the large intestine. So the adage “don’t eat where you work” is absolutely correct. In horses, the larvae of these terrible creatures can become lodged in the mucosal layer of the large intestine, where they can remain in a halted stage of development due to a condition known as “hypobiosis” (a bit like hibernation). They can cause potentially deadly damage and diarrhoea when they emerge, which is known as larval cyathostomosis
  4. Strongyles can induce diarrhoea when they emerge (large redworms). In contrast to their smaller counterparts, these nematodes are harmful to your horse in a different way. During their moult period, which is known to as Larval stage 1, L1, eggs in the pasture moult to become Larval stage 2, which is logical. An unwary grazer consumes the L3 stage
  5. It is the L4 stage that migrates from the gut to the intestine’s vascular supply, where it remains until it is devoured (the cranial mesenteric artery if you are curious). This can result in a weakened blood supply to the large intestine, as well as inflammation of the arteries known as verminous arteritis, which can result in the feared colic
  6. Parascaris Equorum(ascarids)
  7. Another worm
  8. And other symptoms. Do you have a young horse that you want to sell? This one is dedicated to you (sorry!). Fortunately, our equine friends acquire a tolerance to these worms
  9. But, young stock between the ages of 6 months and 2 years are particularly vulnerable. The eggs are thrown out in faeces, and the larvae moult to L1 and then L2
  10. In contrast to giant redworms, it is the second larval stage that is swallowed by humans. They, too, have a potentially harmful migratory pattern
  11. They begin in the intestines and migrate to the liver, where they moult to L3, before continuing on to the lungs. Once in the small intestine, they can moult to L4 status and ultimately adulthood before being coughed up and ingested to begin the cycle all over again. The liver and lungs may be affected, but impacted colic caused by a high worm load, as well as ill-thrift and a pot-belly, are frequent symptoms. Another nematode to look out for is Dictyocaulus arnfieldi (lungworm). Much to my dismay, it turns out that donkeys are particularly susceptible to lungworm infection and carry it around with them since the life cycle of lungworm is not fully finished in horses. Ingested larvae crawl out of the intestinal wall and into the circulation, where they go to the lungs and cause damage to the tissue. In addition to coughing and increased mucus production, they will also cause inflammation of the bronchial tubes. Chronic pneumonia, secondary infections, and pulmonary oedema (fluid in the lungs) are all possible symptoms in people who carry large loads. It is a cestode, not a nematode, that is responsible for the tapeworms. It requires an intermediary host in order to grow from an egg to a larva, and it finds one in the form of the oribatid (harvest) mite. When the horse consumes the mite that contains the parasite, the adult tapeworms can then establish themselves in the caecum (the large fermentation chamber of the horse’s stomach) and small intestine. As a result of their link with spasmodic colic, tapeworms can represent a serious threat to your horse’s health. They can induce food impaction as well as intussusception, which occurs when the colon ‘telescopes’, folding in on itself. For the same reason that inception may be said to be a dream inside a dream, think of intussusception as a colon within a colon.

Other parasites include Oxyurius equi (pinworms, which cause itching and irritation around the anus) and Gasterophilus spp. (worms that live in the gut) (bots; actually a fly larva, and not known to cause many problems despite settling in the stomach). What can we do to combat the worm problem? I’ve worked on several yards where worming regimens were strictly adhered to, both as a method of prevention and as a means of treatment: this is known as interval dosing. Is it absolutely necessary? If I had to choose between a strict ‘yes’ or a severe ‘no,’ I would lean toward the latter.

With increased exposure to wormers, the greater the chance that wormers will become a selection pressure; in some cases, however, certain genetic features in the worms will allow them to survive despite the presence of chemicals that are specifically designed to kill them, resulting in pesky mutants.

As a result, new wormers must be produced on a continuous basis, which is a time-consuming and difficult process.

By being responsible horse owners and avoiding ‘over-worming,’ we can save both our horses and our finances at the same time!

In the life-cycles of parasitic organisms, we can see that the discharge of eggs in feces is responsible for creating an environment ideal for parasites to thrive.

The administration of moxidectin and praziquantel 24 hours before turn-out can assist to reduce the number of worms on a busy yard; these medications are effective against worms in horses who have been quarantined.

There are macrocyclic lactones (ivermectin and moxidectin), tetrahydropyrimidines (pyrantel), benzimidazoles (fenbendazoles), pyrazinoisoquinolines, and benzimidazoles (fenbendazoles) among the insecticides (praziquantel).

Faecal egg counts (FECs) provide an indication of the number of worm eggs present in your horse’s feces; when the FEC reaches 200 eggs per gram, it may be necessary to deworm your horse.

While this is a depressing thought, it’s important to remember that our horses will never have a completely worm-free body, and we shouldn’t aim for that in our worming programs.

The use of wormers should only be considered when the worm burden on our horses has become excessive and is threatening their health.

Is there a worming regimen that works best for everyone?

FECs will not provide a realistic depiction of encysted populations, and they are not judged precise enough for tapeworm counts, according to the experts.

Furthermore, because an ELISA measures the antigen (the immune response to a parasite) level, the burden may appear to be high because antibodies against the previous burden are still circulating, even if the worms are no longer present in the sample.

We must concentrate on which burdens are of concern and when they are of concern.

Stronglyes were historically a major source of worry because of their ability to cause colic; now, owing to ivermectin, they have become less of a threat.

The use of praziquantel or double-dose pyrantel, which are both tapeworm treatments, is also recommended for usage in the spring.

SEPTEMBER: AUTUMN: We must cure any encysted cyathostomes that have formed.

In most cases, these larvae will encyst over the winter, and emergence can occur in the late winter/early spring.

However, a large number of dead worms combined with a significant inflammatory response can result in a disaster in the form of colic.

When treating tapeworms at this time of year, praziquantel or double dosage pyrantel are both effective options.

From all of us at VetHelpDirect, we wish you and your horses a worm-free year in the upcoming year ahead! There is nothing quite like the outside of a horse to do wonders for the interior of a man. John Lubbock is a well-known author.

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