Reference: PBS NOVA
More dog facts.
Prairie dogs, those little pups popping in and out of holes on vacant lots and rural rangeland, are talking up a storm. They have different "words" for tall human in yellow shirt, short human in green shirt, coyote, deer, red-tailed hawk and many other creatures.
The German Shepherd Dog was created by German cavalry officer Captain Max von Stephanitz. In 1899 he registered a dog named Horand von Grafrath as the first official German Shepherd.
Beagles have about 220 million scent receptors in their noses, which makes them among the best sniffers in the dog world and explains why they're always following their noses.