noodle-dragon:Craniofacial diversity exists between and within breed dogs. White strips highlight th
noodle-dragon:Craniofacial diversity exists between and within breed dogs. White strips highlight the palate (left) and brainstem (right) in each skull example. (A) The continuum of airorhynchic and klinorhynchic dog breeds, arranged in order of severity. Examples include a Pekingese (1), French bulldog (2), Chow Chow (3), Bernese Mountain Dog (4), German Shepherd (5), and Borzoi (6). (B) Bull terrier skulls demonstrate the continual morphological evolution in breed dogs. Skulls are arranged chronologically from the oldest (top) to the most modern (bottom). Figure is adapted with permission (Nussbaumer 1982).-The Genetics of Canine Skull Shape Variation -- source link