Get a Break stick, first of all. EVERY Responsible Bulldog owner should own and knoiw how to use one.
There's really not much you can do to "Cure" it. I mean if they were Golden Retrievers, that would be a different story, but they're not. Bulldogs were bred to take on anything on four legs, so it's not surprising that your two are starting to bicker a little bit. My advice would be to just never leave them alone and always keep a break stick ready, just in case.
"When we speak of bulldogs, the words that fit, Are those like courage, stamina and grit."-Floyd Boudreaux
"How many times have we heard the phrase 'I felt so Good I could lick the world!' Well, the American Pit Bull Terrier feels like that all the time!" - Richard F. Stratton