A dewclaw is a digit – vestigial in some animals – on the foot of many mammals, birds, and On dogs and cats the dewclaws are on the inside of the front legs, positioned analogously to a human . "Canine Polydactyl Mutations With Heterogeneous Origin in the Conserved Intronic Sequence of LMBR1" (Free full text).
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That extra nail on the upper, inner part of a dog's foot is the dewclaw. Did you come up with Dewclaws are essentially the thumbs and big toes of the dog world. They are not . Nailed It! 5 Tips for Stress-Free Dog Nail Trims · Great Pyrenees.