https://apnews.com/5fbbf09d01af8e817793a93c1ee6112f > JOHNSON CITY, Tenn. (AP) — 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.