Abstract: A heel sock for a horseshoe and formed of a tubular body of yieldable material, such as rubber, neoprene or plastic, such as polyurethane. The body is open at one end and has means at the opposite end for limiting the extend to which the body can be placed on the heel end of a horseshoe. The inner surface of the body will frictionally engage the outer surface of the heel of the horseshoe. A nail can be driven into and through the shoe and into the hoof of the horse. The body can have a projection thereon and integral therewith. In one version, the projection is between the ends of the body and in another version, the projection is near the closed end of the body. The projections give added traction required for muddy or grassy surfaces. In another version of the sock body, the normally lower wall of the body can be wedge-shaped to elevate the heel of the horse in case the hoof surface has been worn or rasped down too much.