I only read the first 3 pages of this thread, but I just want to add....
We've had same sex aggression issues in our house. First time was with two males, second time with two females.
First time with the males - they were littermates. Raised together and were BEST BUDS. They were inseparable. If one would go out of sight of the other, someone would start screaming bloody murder until he could see his bubba again.
Well, one day, when they were about 2 years old (maybe older?) they got in a fight. Days passed. Every day, there was at least one fight. Eventually, we made the decision to rehome one of them.
We bring Gracie (pit) home from the shelter to foster her.
She got along perfectly with everyone. Until about 4-5 months later, when my mom decided that she was going to adopt Gracie, Sania (senior lab) attacked Gracie.
Since that day, they CANNOT be together, or they will try to kill each other.
Gracie won't start a fight, but she will finish one. And when you put a 4 year old pit against a 14 year old lab - who will win?
Thankfully we have gates set up throughout the entire house. Whenever I move out, I'm taking Sania with me so that Mom can live more stress-free.
Anyone who has ever had to rotate dogs day in and day out knows it gets old and it's tiring and STRESSFUL, especially when company comes over. Not to mention, you lose a lot of bonding time because you can't sit with both dogs next to you. One is always in a separate room, and it can be a little heartbreaking.
Ozzy - Chocolate Pom
-Fastest 2012/2013 U-FLI Pomeranian
"In a perfect world, every dog would have a home and every home would have a dog."