Which anatomical term refers to the underside of the back feet?

The term "plantar" specifically refers to the underside of the back feet in animals. This is consistent with anatomical terminology used in veterinary medicine, where "plantar" is designated for the surface of the hind paw that makes contact with the ground.

In contrast, "palmar" is used to describe the underside of the front feet, while "medial" refers to a position closer to the midline of the body, and "lateral" indicates a position further from the midline. Therefore, when specifically discussing the underside of the back feet, "plantar" is the accurate term, aligning with established anatomical principles in veterinary practice.