Dewclaw - Wikipedia - Canine thumbs
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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 thumb. Although . This acts like a thumb and is used to hold down prey while the jaws rip away the meat from bone. Set well. Sometimes, dogs have thumbs. No, really. In dogs, a dewclaw is an extra digit found in the 'thumb' position of their front paws. A dewclaw includes toe bones.