Evidence of "bone-crushing" dog found at Tennessee fossil site

East Tennessee State University says researchers have discovered evidence of the extinct "bone-crushing" dog at a fossil site that also included herbivores, a sabretooth cat and alligators.

The university says it identified the Borophagus dog at the Gray Fossil Site by finding a single right humerus upper arm bone. The "bone-crushing" animal had powerful teeth and jaws.

The university says this is the first evidence of a dog there. The animal has been discovered at dozens of fossil sites across the U.S and Mexico, usually alongside plants and animals from open environments like grasslands.