I just adopted a 2 year old female BullBoxer Pit (who has just been spayed) from the pound. she had been brutally beaten and the people there said when she came in she was almost dead. she is shy but not skid-dish, and is very calm (doesn't bark or tear stuff up). she interacts well with other people, doesn't growl at them or play too rough. she likes children and gets along fine with other dogs in the park and pet store etc. My roomate has a 1 1/2 year old pit (newly spayed swell) that he just adopted the day before mine. She is highly energetic and very social. she also gets along with our beagle ago other dogs just fine. But my boxer and her absolutely hate each other. they cannot be in the same room before they begin a battle royal with each other. Is there any training methods or medication to fix this? I don't want to return her but I don't want to create unsafe living conditions either. I have heard of muzzle playing where they both get muzzled up and play fight, etc. until they are used to each other but Im not sure if thats what needs to be done. please help, I really love this dog and want to keep her with me.