There may or may not be anything you can do. Socialization early on is VERY important.

Can you tell us precisely how he acts towards other dogs. (We can tailor our answers better from there.) (Things could range from him being aggressive, protective, bossy, dominate, to fearful. And not everyone will agree on our interpretations of his behavior.)

Obedience class may help because it is a somewhat controlled setting. For dog's it's sort of like a job. They learn that there are times when they have to listen to you, and times when they can be themselves.

Socialization sessions with other dogs of certain personality types can help too.

Quote Originally Posted by horse_lover
oh ok...american bulldog, male, 4 what else do you need to know? Just wondering so I can get some help