Are you kidding? Look at the guy's arm. If a dog is "playing" it doesn't leave scratches like that, or any scratches or puncture wounds. The thing f***ing attacked him. Whatever your infatuation is with the good nature of all animals is, GET OVER IT. Not all dogs are happy go lucky, well-adjusted animals. Chows are f***ing psychotic. It's a stereotype about chows for a reason--because it's true. An untrained chow or chow mix is a ticking time bomb, especially to strangers. Unfortunately, this dog had it coming. Probably more the owner's fault than the dog's, but even so, you can't let the damn dog just have it's way with you or your kid.