The bears are a type of animal that live in the snowy mountains. In the episode "Pups Bear-ly Save Danny", their debut episode, they almost reached Danny who was atop a tree. Later in the episode, Everest had to lure them away with treats.
In the series, the bears are not shown to be as ferocious as they can be in real life, but they are definitely shown to be hungry, especially for treats. They seem to be easily lured away by treats as Everest has done.
The bears are mostly a dark, greyish-purple color. The mother bear's cubs are lighter in color but are still dark. Their faces are a light tan color.