Over the past few weeks I've noticed that whenever I come home together with my parents, our dog starts growling at me--and only at me. Tonight he actually tried to bite me, fortunately he was stopped by my father.

I'm really confused by his behavior because inside the house I can play with him and whenever I come home "alone" from work, he doesn't get angry and I can even pet him. It is only when I come home together with my parents after going out that he gets aggressive towards me. Is it because my parents stay with him at home all the time and I don't see him for almost 15 hours a day?

I would appreciate any advice on how to stop this behavior before he ends up biting me.