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24 hour emergency service.


Fecal Egg Counts & Deworming

Deworming at the right time with the right product is critical to controlling parasites.


A McMasters fecal egg count test can help you and your veterinarian create a deworming program specifically for your horses needs.

To gather a sample – pick up 1-2 fresh fecal balls and place in a ziplock bag.

Keep sample refrigerated.

Bring to Summit Equine  as soon as possible.

Results should be back with in 48 hours.

Deworming is recommended only if the egg count is greater than 200 eggs per gram (EPG).



1. Roundworms (ascaris) – large round worm most commonly seen in young horses or immune compromised horses. Large numbers living together in the intestine can cause an intestinal blockage.


2. Small Strongyles – small reddish worms that can encyst in the lining of the intestine. Few dewormers can touch encysted larva. Mass emergence of encysted larva can cause severe diarrhea and colic in horses. This parasite can be resistant to several classes of dewormer.


3. Tape worms – small, segmented worms that attach to the intestinal lining typically around the junction of the small and large intestine. Large numbers of tapeworms can cause colic. Typically a double dose of strongid (pyrantel) or a single dose of praziquantel will take care of the problem. Horses should be dewormed once a year with one of these products. The eggs will not always show up in a fecal egg test.


4. Bot fly larva – round, red, bristly larva that are found attached to the lining of the stomach. Horses should be dewormed one  time a year after a hard frost with ivermectin or moxidectin.

Summit Equine Hospital

1600 E. Williams St

Apex, NC 27539

(919) 362-8879 (Local)

(855) 411-0811 (Long Distance)


Copyright, Summit Equine Hospital, 2016