I recently started getting more involved in the breed by volunteering for an advocacy and rescue group so I started doing a little more research because my knowledge was lacking. i'll be completely honest, I was not the best owner to a pit bull type dog when Iggy was a pup. I just always treated him as what one would call a "normal" dog, not really knowing much about the hate towards these breeds. I didn't understand the importance of doing everything the right way as to protect my dog and breeds like him from being ridiculed. That being said, he has been around a lot of people, and I mean a lot. We also have a lab, 2 chihuahuas and cats that he gets along with, but is NEVER left unattended with. He is now 4 years old and just started to get aggressive when people come to our gate, even when we walk them in, but if he is in his kennel and we walk someone in and then let him out he is fine. I'm just wondering if this could be from his upbringing or if someone could have been teasing him over the fence? Is there any way I could work with him to correct this problem until I can afford for a professional trainer to come out and evaluate the problem?