Imagine the world's largest wolf, and now doubling in size, finally give steroids to duplicate the musculature. Throw in claws bigger than a grizzly with a strong legs to run and reach high speeds ... That leaves us? As a predator that existed from the mid-Oligocene and early Miocene. His name was Amphicyon ingens (dog ambiguous) or commonly known as Bear-dog.
This prehistoric beast could be up to three meters and weigh up to 400 kg. Given its size, you might think was not very fast, but do not be fooled, it is thought that hunted their prey in ambush and surprised with a quick career. The smell was due to an as refined as a bloodhound and a fine ear. Type of game similar to the great bears today. He could hunt animals as robust as the old giant sloths or rhinos.
He lived in Europe and Asia and later introduced in North America by the Bering Strait (humans migrated from Asia to the Americas through the strait, possibly taking advantage of a glacial period and the freezing of the Sea) competition in North America other carnivorous even more ... the Daeodon or "terrible pig."