Briarthorn is a cooshee, a very large one with huge fangs and an attitude of a puppy. He is not bothered by the cold at all. He frolics in the weather, and runs around his mistress's horse careful to not spook it. He is a utterly loyal, and will put himself between danger and her.

Those who have petted the massive dog, knows that he has some plates that resemble scale against his skin. Marking the cooshee as more than it appears.