I don't post much..I mostly lurk but had to post on this one. My little dog I have was just like that as a pup. He would get aggressive when I corrected him etc.. You need to nip this in the bud NOW. Hes' 14 years old now and he is very aggressive towards others. He will not hesitate to bite anyone who doesn't bow to him. He won't go after me anymore because I nipped it towards me but never worked on it towards others. Please work on him before he gets grown up and too big to really correct and you can't handle him. And before he decides biting and aggression is ok. I made the mistake of not researching and working with mine and he's been a monster. He's tried to bite many people. Fix this problem before it escalates and he grows up to be too much to handle. Everyone has given great advice.