As a reminder, all clients visiting the Purdue University Veterinary Hospital are required to wear a mask at all times when interacting with a hospital team member.

We appreciate your patience as we work diligently to provide the best care for your animal. Please understand there will be delays.

Thank you for your efforts to keep everyone protected!

Intestinal Parasites, Fecal Egg Counts, and Deworming

Why are we always talking about horse poop? Intestinal parasites are a very common problem among horses. They can cause clinical signs that include rough hair coat, poor performance, colic, and diarrhea. Some horses can carry a high parasite burden and show no clinical signs; these horses contaminate pastures and infect other horses.

Make an appointment with the Equine Community Practice.

Monday through Friday, 8:00 a.m. to 5:00 p.m.: Call to schedule an appointment for your horse with the Large Animal Hospital at 765-494-8548.

After Hours Emergencies: The Equine Community Practice staff is also available 24-7 at 765-494-8548.

When you submit a fecal to ECP, our parasitology department examines it under the microscope and identifies the number and type of parasite eggs. This allows us to make deworming recommendations based on what your individual horse needs. Many dewormers are not effective today due to overuse and misuse. Most horses only need dewormed once to twice a year. Fecal egg counts help us ensure your horse stays healthy. Stress, new horses in the pasture, and pasture management can all affect the worm burden a horse will carry.
SPECIAL NOTE FOR FOALS: Foals are extremely susceptible to intestinal parasites. Threadworms (Strongyloides westerii) primarily affect young foals under the age of 3 months. Roundworms (Parascaris equorum) primarily affect foals between 6 months and 2 years of age. Proper deworming during the first year of life can prevent these infections.



2 Months

Fenbendazole (Panacur)

4 Months

Fenbendazole (Panacur) or Pyrantel (Strongid)

6 Months

Fenbendazole (Panacur) or Pyrantel (Strongid)



8 Months


12 Months

Ivermectin with Praziquantal for Tapeworms

More Equine Health Tips >>

Purdue University College of Veterinary Medicine, 625 Harrison Street, West Lafayette, IN 47907, (765) 494-7607

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