In the skeletons of the several breeds, the development of the bones of the face, in length and breadth and curvature, differs enormously.

The shape, as well as the breadth and length of the ramus of the lower jaw, varies in a highly remarkable manner.

The caudal and sacral vertebrae vary in number; as does the number of the ribs, together with their relative breadth and the presence of processes.

The size and shape of the apertures in the sternum are highly variable; so is the degree of divergence and relative size of the two arms of the furcula.