American Staffordshire Terrier

Dog

The American Staffordshire terrier is a medium-sized, short-coated American dog breed. In the early part of the twentieth century the breed gained social stature and was accepted by the American Kennel Club as the American Staffordshire Terrier in 1936. The name was changed to reflect difference from the Staffordshire Bull Terrier of England.

http://en.wikipedia.org/wiki/American_Staffordshire_Terrier