Leviticus 11:25-28

25and 1whoever picks up any of their carcasses shall wash his clothes and be unclean until evening. 26Concerning all the animals which divide the hoof but do not make a split hoof, or which do not chew cud, they are unclean to you: whoever touches them becomes unclean. 27Also whatever walks on its paws, among all the creatures that walk on all fours, are unclean to you; whoever touches their carcasses becomes unclean until evening, 28and the one who picks up their carcasses shall wash his clothes and be unclean until evening; they are unclean to you.