The extinct Borophaginae form one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Hesperocyoninae and extant Caninae. Borophaginae, called "bone-crushing dogs", were endemic to North America during the Oligocene to Pliocene and lived roughly 34—2.5 million years ago, existing for about 33.5 million years.
Borophaginae
Canidae is a biological family of dog-like carnivorans, colloquially referred to as dogs, and constitutes a clade. A member of this family is also called a canid. The family includes three subfamilies: the Caninae, the extinct Borophaginae and Hesperocyoninae. The Caninae are known as canines, and include domestic dogs, wolves, coyotes, foxes, jackals and other species.
Canidae
Representatives of three canid subfamilies: Hesperocyon (Hesperocyoninae), Aelurodon (Borophaginae) and Canis aureus (Caninae)
Skeleton of a black-backed jackal (Lupulella mesomelas) on display at the Museum of Osteology
Diagram of a wolf skull with key features labelled