Dire Wolf

The Dire Wolf (Canis dirus) is an extinct member of the genus Canis (which contains the other wolves, the Coyote, jackals, and the other canines), and was most common in North America during the Pleistocene. Although it was closely related to the Gray Wolf, it was not the direct ancestor of any species known today. The Dire Wolf co-existed with the Gray Wolf in North America for about 100,000 years. They were one of the abundant Pleistocene megafauna—a wide variety of very large  mammals that lived during the Pleistocene. Approximately 10,000 years ago, the Dire Wolf became extinct along with most other North American megafauna.
See more at Wikipedia.org...