Waffles is a black bear, not a "brown bear", often referred to as a grizzly.
The bear performing the role of "Waffles" is not a grizzly bear. It is a brown bear. A grizzly bear's shoulders are higher than its rump. Waffle's rump is higher than the shoulders.
When Longmire says, "Bears can run 30 miles per hour," he does so with Robert Taylor's pronounced Australian accent.