[bryanrasmussen]

I would say from reading the description it doesn't have to do all that, because it sounds like the dog is biting indiscriminately at backs of legs of any reasonable large animal, since it is also biting at the backs of human legs. So I think it doesn't really do any non-prey target reasoning, it just does target size X has back of leg, also I don't know based on description that it does incentive - what is the incentive of biting the back of human legs?