Hoof

A hoof (/ˈhuːf/ or /ˈhʊf/), plural hooves (/ˈhuːvz/ or /ˈhʊvz/) or hoofs /ˈhʊfs/, is the tip of a toe of an ungulate mammal, strengthened by a thick, horny, keratin covering. The hoof consists of a hard or rubbery sole and a hard wall formed by a thick nail rolled around the tip of the toe. The weight of the animal is normally borne by both the sole and the edge of the hoof wall. Hooves grow continuously, and are constantly worn down by use.