Years ago, horsemen used grease or wool fat to try to keep feet from getting too dry and as a moisture-repelling barrier to keep them from getting soft.

Among many of the challenges a farrier must deal with are sheared heels. Scott Morrison, the veterinarian and farrier who leads the Podiatry Department at Rood & Riddle Equine Hospital, Lexington, Ky., says this problem is usually the result of less than ideal conformation. Usually the horse toes in or out, putting more stress on one side of the hoof wall (and heel) than the other. When a horse develops sheared heels, the stressed heel becomes jammed upward, the hoof symmetry is distorted and one heel is bearing most of the weight.