Metacarpal Pad of Rottweiler
Metacarpal Pad of a Domestic Dog

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