We got a mini schnauzer from a friend of ours that is 4 years old. He is proctective and when females come in the house he nips at them. He is very snuggley but he seems to be getting more aggressive and I'm getting worried about taking him around kids since he has been nipping at and tried to bite my aunt and he nips at other adults. I'm afraid to take the dog around my nephew who is almost two and my niece who is only 6 months old I'm afraid he will bite them. I don't know what to do.