I need help with my pup. ***not getting rid of him & he's not lost*** he came into our family 1 month ago. he will be 1 on 12/23. he is VERY skiddish and today for the first time he was aggressive towards 2 different guys. and growled a lot just today. he has never growled at me or my girlfriend. he lets us kiss him in the face and everything. he is great with dogs but lately not with other people. I feel like his aggression is more towards men. but I do not know his background. hopefully this is allowed on the page. I need a trainer to help me with this problem. thanks in advance