3. They're as fast as some race horses, and can reach speeds of up to 40 mph.

DOGS
In 2006, the birds of Middle Island found a protector in an unlikely canine friend.
The federal agency is seeking permanent homes for its former explosives detection canines.
Learn more about the pup and its roots in the … Wild West?
Blink once and these fast little pups are gone. Learn more about the spunky English racing dog.
According to one study, dogs tilt their heads when they hear words that are meaningful to them, like the name of their favorite toy.
Learn more about one of the world's oldest lap dogs.
Dobermans have a reputation as menacing security dogs, but that doesn't mean they don't have a soft spot. Learn more about the second best guard dog in the world.