Totally agree with Pat. I have two intact female B's. They are NOT the best of friends and have to be watched constantly. They are never alone together. Yes, they've gotten into knock-down drag-out fights. I've been in the ring with slit throats, chewed up ears, scabs, etc. Not a good idea at all. I can control it simply because I watch them constantly and when they start to show signs of aggression, one goes into the crate. But it's not easy, it's stressful on everyone, and I really don't recommend it.
