Prince is already pretty protective for me... barks if something hurts me, he is only a pup, so I don' tknow if he would attack. I know who woiuld though. My cousin has two dogs, a chihiaua (sp!) dachshund(sp!) mix, and a Rat Terrier. the mix is Chico ("small" in spanish) and Rufus. They start biting and barking...