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I've done it annually for years
Posted by Sally on 8/19/2015, 11:11 pm, in reply to "panacur powerpac"
My horses have never had a problem. However, there appears to be some small strongyle resistant to the 5 day double dose of fenbendazole (Panacur) purge, plus some evidence that it can cause ulceration of the large colon. A single dose of Quest (moxidectin) seems to work just as well.