You know once the guys are neutered they are passive, right? That's why barn owners won't keep the males. Chop their manhood off and they will never kill another mouse. So I have the males here (the females go to the barns -- they will hunt, whether they have babies or not) because they can't survive on their own. So to see them assert themselves with a 75 pound dog is hilarious! She could break their backs with one crunch.