A device or structure for fitting on the bottom of an equine leg cast to protect the cast from abrasion and wear, to aid in keeping the cast clean and, in one aspect, to provide a shaped molded rocker bottom that allows the leg cast hoof to rock forward or back, allowing the equine to find a naturally comfortable position and the method of applying the device to an equine leg cast. The device or structure consist, in general, of a solid member having a top face and a bottom face and having malleable straps attached to the solid member and extending from at least two sides of the solid member, which straps are made of material and sized to be capable of being bent or folded upward in a plane perpendicular to the top face of the solid member to attach to an equine leg cast.