The medium dog, he always pulls her tail and paws and steps on her paws or he tries to sit on her. He does this just to hear her
yelp. That is what is so disturbing. he hears her yelp and then he will mimick the sound and then try to hurt her again untill I physically pull him off of her. He has now escalated to punching the poor dog, and the dog is getting closer to actually biting him. I have tried to punish him every way possible, and nothing works.