Wow, I'm no expert, but I've never in my life owned a dog who was human-aggressive. I'm not sure about other bully breeds, but I know that human-aggression is absolutely NOT a characteristic of the APBT and any pit that shows aggression towards people, is not a dog you want to own. Any dog who is showing signs of being aggressive towards people ESPECIALLY it's owner, is potentially very dangerous. Hopefully you watch this dog closely and pay attention to these warning signs. Ignoring and or mis-reading human-aggression can lead to a big problem. Good luck.