Deworming Your Horse

Strongyles in manure.

Strongyles in manure.

Prior to starting any deworming program, a fecal exam should be done. This will help to determine your horse’s parasite load, the efficacy of your current parasite control program, and which deworming program your horse should go on.

There has been parasite resistance reported with all dewormers, so it is highly desirable that a fecal exam is also done two weeks after deworming. This will check to see if your horse has worms that are resistant to the dewormer you are using.

Just bring us a fresh fecal ball; we’ll take care of the rest!

Dewormers

There are a variety of deworming products on the market today. Most will do an excellent job of protecting your ADULT horse against internal parasites when used appropriately. To avoid developing worms that are resistant to the available dewormers, it important to use them in a slow rotation, as in the programs outlined below.

Good Practices

To minimize your horse’s exposure to parasites, all horses that share a pasture should be dewormed at the same time. When adding a new horse to the pasture, it should be dewormed several days before it is turned out onto the field. Horses under 1 year of age, or thin and debilitated horses require special deworming programs; contact us for a specific program for these horses.

Deworming Products

Ivermectin: The first paste dewormer to kill bots at any stage in the horse. Is also responsible for the vast decrease in verminous arteritis colics by killing the large strongyle larvae that can live in the mesenteric artery (the main artery supplying blood to the intestines). Deworming interval with ivermectin is 8 weeks. Not recommended for horses under 4 months of age. (Eqvalan, Zimectrin, Equell)

Moxidectin: The newest dewormer on the market, kills bots at any stage. It kills small strongyle larvae encysted in the intestinal wall. These larvae are responsible for many of the late winter/early spring colics when they emerge from the intestinal wall. Deworming interval is 12 weeks. Not for use in horses under 6 months of age. (Quest )

Pyrantal Pamoate: Does NOT kill bots. At a double dose, does a good job of killing tapeworms. Deworming interval is 6-8weeks. (Strongid P)

Praziquantel: Excellent at killing tapeworms. Does not kill strongyles or roundworms. Only comes combined with either Ivermectin or Moxidectin.

Fenbendazole: One of the original dewormers. There is significant resistance of some worms to this drug, so check with us for its appropriate usage. It is most often used as part of a 5 day, double dose larvicidal treatment. (Panacur, SafeGuard)

Oxibendazole: Related to Fenbendazole, but little worm resistance. Deworming interval is 6-8 weeks (Anthelcide EQ)

Pyrantal Tartrate: Used as a daily dewormer. Very useful in situations where not all horses on the premises are on a good deworming program. Controls “incoming” parasites, Horses must be dewormed with either Ivermectin or Moxidectin prior to starting daily deworming program, and then every 6 months thereafter. Not recommended for horses under 1 year of age due to rapid gastric emptying time.

Deworming Programs

Regardless of which program chosen, it is important to have a fecal exam done just prior to starting a deworming program in the spring.

The results of the test, along with your horse’s deworming history, can help us choose the most effective program for your individual horse.

Below are some suggested deworming programs. We would be glad to personalize a deworming program for your individual horse or horses.

Worming Program 1

February or March:

Quest

May or June:

Quest (or Quest Plus), Fecal Exam 14 days later

August or September:

Quest

November or December

Quest Plus

Worming Program 2

February or March:

Ivermectin

April or May:

Ivermectin, Fecal Exam 14 days later

June or July:

Ivermectin

August or September:

Ivermectin

October or November:

Ivermectin & Praziquantal

December or January:

Quest

Worming Program 3

February or March:

Pyrantel Pamoate

April or May:

Pyrantel Pamoate, Fecal Exam 14 days later

June or July:

Pyrantel Pamoate

August or September:

Pyrantel Pamoate

October or November:

Quest Plus, Ivermectin & Praziquantal, or DOUBLE DOSE of Pyrantel Pamoate

November or December:

Pyrantal Pamoate

Worming Program 4

February or March:

Oxibendazole

April or May:

Oxibendazole, Fecal Exam 14 days later

June or July:

Ivermectin or Quest

August or September:

Oxibendazole

October or November:

Oxibendazole

December or January:

Quest Plus or Ivermectin & Praziquantal

Worming Program 5

One day prior to starting program

Fecal exam, then deworming with Ivermectin & Praziquantal

Daily

Strongid-C 2X

Fall

Quest Plus or Ivermectin & Praziquantal

Spring

Ivermectin or Moxidectin

Your horse may qualify for Pfizer’s Preventicare program, which provides up to $5,000 in colic surgery assistance. Check with us for details.

LYME Disease


Tick season will be here before we know it. We will be starting our spring Lyme clinics in late February—stay tuned.

Winter Education Talk

Don't miss our educational event! Read more...

February is Dental Awareness Month!

We offer a 10% discount on all equine dental procedures performed in our heated clinic February 1-March 15. Get a jump on Spring by getting your horse’s teeth in pristine shape! Read more...

Evergreen Equine
of Vermont
Dr. Heather Hoyns

Mailing Address:
P.O. Box 126
Reading, Vermont 05062

Telephone:
(802) 484-9100
Fax:
(802) 484-9104

evergreenequinevt.com

Find us on Facebook!

Like us on Facebook!