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Arctodus simus, giant short-faced bear skull

Arctodus simus, also known as the giant short-faced bear, is an extinct species of bear. The genus Arctodus is known as the short-faced or bulldog bears. Arctodus simus is the largest bear, and more generally, the largest mammalian land carnivore within the last 20,000 years. It was native to prehistoric North America from about 800 thousand years ago, and became extinct about 12,500 years ago. It was the largest terrestrial carnivore of its day. The largest mature males would have stood 2m (6.6 ft) at the shoulder (on all fours), 3.4m (11 ft) upright and an impressive 900kg (2000 lb).

This was a very old animal as shown by the extreme ware on the teeth.

From: http://en.wikipedia.org/wiki/Arctodus