The difference between a pit bull and a chiuhaha or retriever is that a pit bull can kill an average unarmed person, and chiuhaha can't. it's the same as having a hyena as a pet, sure it maybe nice to you, but if it ever does decide to go attack you, it has the ability to kill you or seriously seriously hurt you. pretty sure if my buddy Sport, a boston terrier ever goes ape shit and tries to kill me, he may leave a few marks, but I can stop his ass lol.