Category: Our Blog

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #5:  Tail Rubbing The characteristic tail rubbing associated with worms is generally due to pinworms.  The female pinworm partially exteriorizes itself and lays her eggs around the rectal ring.  The eggs stick to the skin with a substance similar to egg whites.  This substance causes an itchy sensation causing the horse to… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #4:  Ulcers Bots, Draschia megastoma and Habronema musccae are 3 classes of worms that can be responsible for ulcers in the stomach.  Bot worms are the larval stage in the cycle of a Bot fly.  They look like a small honeybee and they fly around horses’ legs, gluing eggs to the hair… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #3:  Chronic cough, Runny nose Round worms can also be responsible for coughs and runny noses in young horses most often under one year of age, but may even occur in horses slightly older.  One stage of the life cycle of the roundworm is larval migration to and through the lungs.  During… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DVM Problem #2  Wormy Horse Syndrome:  Weight Loss, Diarrhea, Stunting, Poor Hair Coat, Depression, Poor Appetite, and Potbelly appearance  I have elected to discuss all these problems together because they all appear to occur together.  The problems are generally seen in young horses less than 2 years of age.  They are most often… Read more »

Six Problems That Can Be Due To Worms

By John Byrd, DWM Problem #1:  Colic Colic just means a horse has pain in its abdomen.  There are many causes of this pain and different worms can cause colic.  Round worms can cause the pain when a young horse, such as a weanling or yearling, is heavily infected with adult round worms.  These young horses seem… Read more »

The Importance of Performing Fecal Egg Counts on Your Horse

Below is a link to an informative article on the importance of performing fecal egg counts on your horse written by Dr. Craig Reinemeyer.  Occasionally I refer to “Equine Parasite Control”, the book he wrote with Dr. Martin K. Nielson because Dr. Craig Reinemeyer is dedicated to improving horses’ health through parasite research.  Dr. Reinemeyer… Read more »

Why should horse owners have fecal egg counts performed on their horses?

To help slow resistance development of dewormers. To determine how effective their horses’ worm control program is working. To determine what worms are active in their horses’ environment. To determine which deworming medications work best for their horses, To determine which horses are low, medium and high contaminators (shedders of eggs) of their pastures. To… Read more »

Why should you do Fecal Egg Counts on your Horse?

By John Byrd, DVM How do you know my horse has worms?  How do you know you got rid of the worms my horse had?  These two questions were commonly asked when I dewormed horses as a general equine veterinarian.  My standard response was that the drug companies tell us they work.  When the daily dewormers came… Read more »


Recently one of our clients at Horsemen’s Laboratory asked about the accuracy of our testing methods. Horsemen’s Laboratory was established in 1991 and since then we have tested over 66,000 samples. In addition, we have sent samples to the University of Illinois, School of Veterinary Medicine Department of Parasitology and to East Tennessee Clinical Research,… Read more »


A client recently asked, “How effective is Diatomaceous Earth as an agent to prevent or control worms in horses?” Here’s what Horsemen’s Laboratory has found through performing fecal egg counts on horses that are being fed Diatomaceous Earth. In horses that are high shedders, the egg count is often fairly high, 500 strongyle eggs/gm of… Read more »