Kristl,

I'm not saying this to be rude, and don't take it the wrong way, but you will have to stop worrying about everything Bull does, I understand that he is your first dog, but you will make it through trust me!

Growling and barkingis just a thing dogs do, you can't stop it, it won't harm him or you! He is just playing, if they are aggresive which I doubt such a young puppy would be, then their hair would be up ears pinned back(or forward if a dominance issue) and his tail would be straight out or tucked(possibly up high if dominace as well), just try not to worry!

Its ok! Please don't take this the wrong way!