The bull terrier also has a distinctively egg-shaped head that is flat on top with pointy ears that stand up. Its eyes are small and close-set, and it’s the only dog breed with triangular eyes.

The bull terrier in 1915 appears to have been a fit dog with a well-proportioned head and slim torso. "Dogs of All Nations" called it the "gladiator of the canine race." Source: "Dogs of All ...