I have a Golden Retriever who's an alpha dog too. He's 11 months old now and starting to settle down. He was neutered at 7 months old because he was starting to get too aggressive - not typical for a Golden. I've found that he really seems to boss my wife mostly, but that's because she gives into his demands. When he's too demanding, he thinks our attempts to control him is a game and barks at us. Things we've done are basic training - sit on command and down. Try keeping a leash on your dog in the house. It's easier to get control of them.