Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
A cleft hoof as of neat cattle (Ex. 10:26; Ezek. 32:13); hence also of the horse, though not cloven (Isa. 5:28). The "parting of the hoof" is one of the distinctions between clean and unclean animals (Lev. 11:3; Dt. 14:7).