Upright of course. A chow mix named "Faith," born without front legs, is inspiring many as she goes on tour with her agent, Mike Maguire. This dog has learned to adapt to its difficult situation by walking like its owner, bipedally.

I must clarify this is not an example of dog evolution, just resourcefulness. After watching this video of the two-legged dog walk, I've decided the most remarkable thing about this chow is surely the very thing the videographers didn't show us: the marking of territory. That, after all, must be accomplished on one leg, no?