Resistant Worms: Do Your Horses Have Them?

EDITOR'S NOTE: This is part nine of a 12-part series on internal parasites of horses.

Most people assume that when they administer a tube of dewormer to a horse, the drug is effectively killing worms. The drug must work--it says so there on the label. Right? Unfortunately, the answer frequently is no. All dewormers were highly effective when they were first

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