I know your angry at Baby right now and probably terrified she'll do this again, which I can definately understand. But I'm not sure that keeping Baby locked outside and Tikeya in is a good thing either. I would guess that it may make Baby resent Tikeya more and make matters worse. Right now it sounds like the trigger for this fight, was that Oscar wouldn't leave Baby alone and when she tried to discipline him, Tikeya got in the middle by trying to stop Baby. I had a really similar situation with my 2 females Savannah and Nikka. They got into a really bad fight once as well a couple of months after I adopted Hunter (a puppy). Savannah instantly took the role of mom/dominant female, so if Nikka tried to discipline him for being to nippy or spastic Savannah would immediately intervene. We had them all in the back yard once and all of a sudden heard a horrible commotion. When we looked out, Savannah had Nikka pinned against the fence. We ran out and broke it up. My roomate took Nikka into the house to check her and I kept Savannah and Hunter with me to check her. Both girls had some scrapes and couple of bite marks, not enough for a vet trip but enough for us to do some minor first aid. After about a 1/2 hour we put Hunter in his crate and brough Savannah in. The 2 girls did a lot of sniffing, hackles raised, etc., which we let happen, but were prepared to intervene. Eventually they just went on about their normal business. We were a little cautious with them together for a couple of days and kept Hunter from bothering Nikka when home. The first day we had to leave them alone we put one in one room another in another and Hunter was crated. We didn't see any signs of aggretion from them when Hunter wasn't around so the next day we left them out together (Hunter was crated which was normal for him when we left). I'm not a behaviour expert but I have been through something similiar and in my opinion your main concern should be when Oscar is involved. It sounds like your not surprised Tikeya protected Oscar so it's something that occurs often. Just try to keep Oscar from annoying Baby which means Tikeya won't need to intervene. If your really not comfortable leaving them together when your not around I'd either lock one in one room one in the another, or alternate who gets outside time. One day Tikeya, one day Baby. Just my opinion.