Controlling parasites that feed on and damage the equine digestive system and various body organs must be an ongoing effort on the part of horse owners if these relentless attackers are to be prevented from compromising the animal’s health and ability to perform. Despite scientific advances, it is a war that is difficult to win. We can win battles, but the war goes on. Relax for a moment and the parasites will attack with renewed vigor and quickly multiply.

COURTESY FARNAM COMPANIES Today, effective dewormers are available in paste and gel form that can be administered easily and effectively.

A discussion on the parasites themselves and of some management procedures that can be employed to control them is relatively basic and straightforward. However, when the discussion turns to treatment programs involving dewormers, it moves to controversial ground. The reason for controversy also is basic. The equine dewormer market is a large one, and a number of major companies are vying for their share.

Competition is healthy, and, in the case of dewormers, the horse has been the beneficiary as each company has sought to place before the consumer a product that answers the horse’s needs. In this article, we will attempt to negotiate a path through this informational maze in such a way that we will inform the horse owner so that he or she can make proper decisions on how to treat a particular horse in a particular situation