We started out with two females and they never fought over anything, got along just great. They both knew Calli our oldest and biggest was boss and Berk was okay with that so no problems. Then we got Teaki and that changed things. They all knew that Calli was boss and left her alone but the other two (Teak and Berk) would get into it sometimes I think over who was second in charge! They never went after Calli or tried to get into a fight with her. Our age differences could have had something to do with it too. Calli was almost 6 or just 6 years when we got Berk who was between 12-18 months they didn't know for sure on her because she was a rescue. Calli was almost 10 and Berk was around 4 when we got Teaki as a puppy.
We had three females and for the most part they got along great and loved playing, sleeping and even eating together. They never fought over food, toys or mats. The thing that they fought over was bones, UPS man, and usually other wild/domestic animals they could see from the house. We always put out one extra bone when we gave them each one so there was that extra one laying there, of course out of the 4 bones there was ALWAYS the special bone and before it was done all of the bones had been switched around until everyone had the one they wanted. We never left them unsupervised with bones and knew when one was having issues to make sure we removed the bones or separted the dogs with them. When they got into fights because of the other animals outside or the UPS man it was more like they got mad because they couldn't go out and see them so they took it out on each other. There were some really bad fights with lots of blood between our youngest two females but they were always best buddies afterward and acted like nothing happened, lots of kisses given to each other after a fight. We did notice that Teaki was the instigator in most of the fights of course after the fight started neither one of them would ever back down, we had to physically pull them apart or use a chair to try to separate them. There was always cuts and bites and lots of blood. It is scary seeing them fight like that, when they are so loving to each other the rest of the time.
We now have Teaki and Zig. After we lost Calli and Berk my husband said we were getting a male only for our next boxer. Zig is now the aggressor and boss. Of course he is almost twice the size of Teaki so that could have something to do with it. 8O We had several fights with them over food all started by Ziggi. He is only aggessive over food.