Metacarpal Pad of Rottweiler
Metacarpal Pad of a Domestic Dog

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Metacarpal Pad
Limb pad located at the metacarpus, under the metacarpophalangeal (MCP) joint.
This is the largest of the pads on the palmar surface of the forefeet of cats and dogs.
Also known as palmar pad, palm pad, and [by Revealing Paws] as heel pad.
Cf. metatarsal pad