I'm not a dog person. And having been nearly taken out by overexcited pups more than once and scolded by overprotective owners thereafter, I'm definitely no proponent of dogs on the trails with bikers. (I generally think even less of overindulgent animal videos.) But then there's the Jack Russel terrier, the little man of the dog world: fiesty enough to pick a fight with Cujo, prouder than Herman Cain, and apparently nearly as capable on the downhill as Aaron Gwin. Check out the air Lily gets on some of those tabletops (1:56, 2:22). Brings new meaning to the expression trail hound.