Hope you've got two people; each grabs a tail and works there way up the back to get control of the head. If your alone; hope one of the dogs is pretty good at listening to you, so you can kick them off, when you get to the aggressors head. I never seen it done with anything akin to grace, and girls are ten-times harder to break-up than boys. It's much better to make sure it doesn't happen. Water hose; can stop a fight if you have correct timing, but once they're in a real fight it just equals = blood and everyone wet, you'd have to have a fire-hose pressure to break some apart, when they decide to get into it.