I agree with lizbud. I've had dogs to that. I had a Staffie(14 inch male) try to pick a fight with a GSD bitch(standard 23 inch female) who was sitting with her pups. Well, guess who won. Lol. The mother GSD of course. The Staffie got what he deserved for trying to pick a fight with a mother dog. Also, my Beagles will try to scuffle with the Staffords, GSDs and particularilly like t opick on the Chihuahuas becasue they are the smallest. I've had Chihuahuas try to pick fights with the Staffies, Beagles and GSDs. They aren't very smart little dogs. Lol. I have some male and females of each breed that have to be kept appart all the time other wise fights break out. But, my little mix, Kiki, is definately alpha male, and alpha dog of the house. None of the other dogs, even the ones bigger than him, dare not pick a fight with him. Once, my big 27 inch male GSD attempted to challenge Kiki(who is only 12 inches), came away with his tail between is legs. Kiki showed him who was boss. Lol. I wouldn't worry about having to rehome her. You might have to keep them separated for a while. After, have you take one dog, and your husband(if you have one) or a friend take the other. Keep them on leashes(muzzles might be good too). Slowly, introduce them again. It's worked for me. I do this whenever my dogs scuffle. Give it a try and let me know if it works Good luck