Equine Pinworms: Ick.Equine pinworms aren’t as dangerous as other internal parasites, but they do cause intense anal itching. Needless to say, horses don’t find this to be a pleasant sensation. If your horse is rubbing his tail, causing broken tail hairs and bare patches around the tail, suspect pinworms. Pinworms enter your horse via contaminated water, grain, hay or grass. Young worms mature in the large intestine in three to four months. Adult worms crawl part way out of the anus to deposit their eggs on the adjacent surface. The eggs hatch outside of the horse's body, fall to the ground and wait for their next host. Female pinworms make their egg-laying journey under cover of night, so you may not see any worms when you horse's anal area. To test for pinworms, your veterinarian will use a clear tape to determine if pinworm eggs are present. The most effective treatment for pinworms is a regular deworming program. Dewormers such as ivermectin, benzimidazoles, moxidectin, or pyrantel pamoate are available and will end the pinworm problem very effectively. It’s possible that pinworms can cause digestive disturbances and stress, so it’s best to maintain a suitable deworming program. Tip: Use paper towels or disposable "wipes" for cleansing the dock area. Sponges can harbour eggs and the infection.
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