I have a male pitbull - husky mix breed dog that is about 16 months of age. He has not yet been fixed as I had been given the advice to wait until he had grown to size before altering his hormones in any way. From the time I got him (when he was about 3 months old) till about 2 months ago he was extremely friendly with both people and other dogs. I never heard him growl or act aggressive in any way towards another person or dog. At the current time he is still very friendly with other dogs. However a few months back I heard him growl at someone for the first time. It has happened more times recently but it usually happens if he is sitting somewhere or on a leash with me and a stranger comes up to him to pet or greet him. He usually doesn't act aggressive if he is allowed to make the first contact with a stranger on his terms by walking up to them. Also, he never acts aggressive towards any person who interacts with him on a weekly or more frequent basis (family members , friends, etc) My question is will getting him neutered cease this aggression toward strangers? I would like to have people (even strangers) be able to interact with him without him getting aggressive in any way towards anyone.