See Canon Bone.

The third metacarpal bone, above the fetlock joint.

Fused metatarsals or metacarpals.

the lower part of the horse's leg, the same as the human shin bone

greatly developed metatarsal or metacarpal bone in the shank or cannon part of the leg in hoofed mammals

leg bone above fetlock (ankle) joint

The third metacarpal (front leg) or metatarsal (rear leg), also referred to as the shin bone. The largest bone between the knee and ankle joints.

The bone of the lower foreleg between the knee and the fetlock. Also called the "shin bone". In the hindleg, the corresponding bone is called the shank.