These are caudal views (from behind) of the dog displaying the muscles of the hindlimbs as well as the bones of the skeleton of the hindlimbs and tail.
Ellenberger, Wilhelm, Hermann Baum, and Hermann Dittrich. 1911-1925. Handbuch der Anatomie der Tiere für Künstler. Leipzig: Dieterichsche Verlagsbuchhandlung.