For what it's worth, it's been my experience that once two dogs get into it, they cannot be together at all. Up until about a month ago, I could let Jasmine and BJ play together. Then, one day Jasmine decided she didn't want to play anymore. She's a little over 10 months old right now. I told my husband, after their altercation, that they'd never be able to be together again. I was proved right when I was walking BJ and went over to Jasmine's pen. BJ got to the fence and they instantly started growling and then BJ lunged. Had I not been able to pull her away from the fence, I'm sure it would have gotten nasty. Now, granted my experience is with aggression between 2 pit bulls, but I'd still watch an APBT with any other breed it has shown aggression toward.