Dew Claw of Dog Paw

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Vestigial and rudimentary digit of the foot.
Some digitigrade animals, including dogs and cats, have dewclaws located on the medial (inner) side of the foot, (usually) too high up to make contact with the ground or register in a track. Some ungulates have a pair of dewclaws on each side of the foot.
The dewclaw is identified by the Roman numeral I, the other toes from II to V.
In contrast to other toes, only two phalanges are usually present. Where dewclaws are present on hind feet, they often lack phalanges.