Cynodesmus

From Turtledove

Cynodesmus is an extinct genus of canine. The 1 m (3 ft 4 in) long creature was one of the first canines to actually look like one. It probably looked like the modern coyote, but had a shorter skull, heavier tail and longer rump. Also, Cynodesmus was not a very good runner compared to most other canines; it probably attacked prey from an ambush. Like felines, it could (partially) retract its claws.

Harvey Cutter, who had traveled back ten million years to Miocene Italy to capture live specimens of primates for the San Diego Cenozoic Zoo, observed a pack of Cynodesmus hunt and bring down a Diceratherium.