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A dewclaw is a digit – vestigial in some animals – on the foot of many mammals, birds, and reptiles. It commonly grows higher on the leg than the rest of the foot, such that in digitigrade or unguligrade species, it does not make contact with the ground when the animal is standing. The name refers to the dewclaw's alleged tendency to brush dew away from grass. On dogs and cats, the dewclaws are on... Wikipedia