The English Bulldog of today is a far far far cry from the English bulldog of yesteryear. The aggression and tenacity of Bulldogs has FAR been dulled down ever since the outlaw of their bloody sport. Most "bad" behavior today is just a miscommunication between dog and human (and, besides, it doesn't sound like this pup is necessarily being aggressive than a regular adolescent).

A reward system works with all animals. As does punishment. Positive/negative reinforcement and positive/negative punishment are the building blocks of basic animal behavior and learning. But punishment can merely suppress symptoms as can a person reward the WRONG behavior. The trick is to know the right balance of positive/negative reinforcement and positive/negative punishment. Most people would agree that alpha rolls are unnecessary forms of positive punishment. From this person's post, it sounds like the alpha rolls aren't even registering with the dog. If they're not working, why keep doing it?

Leadership is based on respect, not physical dominance. It takes longer, but it stays. A subordinate dog willingly rolls over onto its back. The alpha does not need to physically grab it and roll it and hold it there. My reactive dog willingly Down's and rolls over onto her back BY HERSELF. I do not need to roll her, I never have, and I never will.