Many aspects of horse care rely largely on customs and a sense of “It’s always been done this way.” And while it’s never a good idea to let tradition guide your management decisions, nowhere is this attitude more harmful than when it comes to parasite control. In fact, the longtime practice of routinely deworming horses every eight to 12 weeks is putting the health of horses around the world in jeopardy.
Here’s why those old practices are so wrong: Each time an anthelmintic (worm-killing) chemical is used, most of the targeted pests in a horse’s
