We got lab is he was 6 months old. He was terribly neglected, thin, bloody patches from flies. He fit into our home perfectly. He has a fenced yard, dog door and even his own deck to lay on. I walk him every day and play with him and so does my husband. He is be five years old and showing aggression to men including my husband, particularly if he gets out of the house a into the neighborhood. He has not been nuetered and has just had physical at the vet. The behavior is only when he is loose. He is never aggressive to me. My husbands heart is broken over this sudden aggression towards him and of course we worry he is going to bite someone.