Yeah, same. Dogs are fairly ignorant about blubber beasts physical appearance unless their owner put a fair amount of work in that particular training of ignoring fats.  Although, one of my dogs always barks at black people. While I would find the notion of a racist dog funny, I know that he hardly met non-white folk so Blacks don't fit his expectation of "human". So maybe a dog coming from a fit environment might share our attitude about fats not being human and therefore considers them "environment". Then again, dogs are ok with a machine throwing the ball. So I don't know.