Thanks everyone I will try your suggestions here are the answers to some of your questions. No I don;t have a prong collar Kongs trainer doesn't believe in them

I do turn around when he bites and he bites my clothing or my legs. He is 4 months old. Mercedes doesn't do anytyhing when he bites her but ignore him and look at us as if she thinks SHE is doing something wrong. He IS crate trained I will try this. He is the worst when we are outside I find...
Thanks Everyone!!