High Quality Content by WIKIPEDIA articles! Paracynarctus is an extinct genus of the Borophaginae and a terrestrial canine (Bear-dog) which inhabited most of North America during the Early Hemingfordian stage of the Early Miocene subepoch through the Early Barstovian stage of the Middle Miocene subepoch 20.6—13.6 Ma, existing for approximately 7 million years.