I did get stitches, from bitches.
Then I went to never letting bitches be together at all.
That was over kill.
It all depends on temperament. And it isn't bad temperament when you have a GSD bitch that fights with other bitches. If they are close in age and in power, then you are likely to have fights. If you have a beta bitch -- an alpha bitch walks around like she owns the world and every other dog and bitch knows this, and there are no fights at all, generally. Jenna was my alpha bitch. One time when she had a litter of puppies, my crazy bitch, Ninja went after her, and she took her down so fast. I had been moving her and the litter, and had Ninja crated. Ninja broke the crate open, which was probably a surprise for her, and she immediately attacked. Two seconds later, I was in a kennel with Jenna still attached to Ninja's muzzle, but I was working a kennel gate between them and managed to get them apart.
If you have a beta dog, like Ninja -- they are the wanna-be-alphas, that will fight often, and are always trying to upset things. They are not a natural alpha, but they may be the top dog, often briefly. They wouldn't survive well in the wild as a leader, because you have to be whole to maintain your body condition when you have to run down prey.
But in the wild, if all the dogs were alphas, there would be a lot more fighting. So alphas are not that prevalent. Everyone things they have an alpha. They don't. If there bitch is fighting, it is probably a beta. It could even be an omega, because for some reason, some dogs will try to eliminate a weak-nerved dog. These dogs are fighting for their lives.
And bitches CAN kill another bitch. We've all heard the horror stories of folks coming home to find one bitch dead and the other in need of euthanasia and blood everywhere. Thank God it hasn't come to that for me yet.
Right now, I mostly have dogs in pairs, Cujo is in with Uzzi because her dam has a litter of puppies. Kojak is in with Ramona. Bear is in with her last puppy. Bear will be 10 in March, and Tinuviel is not two yet -- usually a mother/daughter combo can work. Though with Jenna being and alpha and her mother who was 4 years older was not naturally alpha but the top female -- she would let Babsy in with her puppies (out of the next litter), but she wanted to kill Jenna. Babsy might have been a baby-sitter type in the litter.
I had Babsy in with Hepsi, and one day there was blood, so I separated them. Both bitches were kind of lower on the totem pole. So it surprised me. Also when I came home, there was blood, but neither bitch acted like they wanted to eat each other. I think it was an accident. I had Babsy in with Quinnie, and Kaiah, and that worked fine until I had to put Quinnie down, and then Babsy, but no aggression. Then I put Kaiah with Hepsi and Cujo2, until I had to separate Uzzi from her mother.
So Kaiah who is 1 is in with Hepsi who is 8, and they play together fine. You don't know at 8 weeks whether your female pup is going to be a beta bitch, a middle of the road bitch, a lower bitch, an omega bitch.
And, what starts off the fighting. Some dogs it's food, high value treats, toys -- that a biggie, but more often is the resource of the human that sparks fights. So the dogs come running when you come in from work, and you start petting them, and the bitch who is stronger in pack order, is seeing you pet the inferior bitch, often first, and that infuriates her, not against you, because you are like God. She can't be angry at her god. She must be angry at the object which is the other bitch.
So, yeah, if you get a good behaviorist, who actually knows more than I do about pack order and how to regain harmony in a multi-bitch household and you are willing to go the whole nine yards. Maybe you could manage it.
Safety first, you need to manage them 100% of the time. You may be able to have them together when you are there, but you have to get real in tune with their body language, and those things that set them off, like you petting the lab. Never, ever leave the house without both dogs crated or kenneled separately.
What I think you will find is that you will have to up your leadership. That means you walk tall, you ignore them until you are ready to pet, play, train them. You expect obedience and always follow through with any command. You do not let them believe there is a choice. You never fight, never raise your voice. You use your voice to show displeasure and pleasure. You are totally consistent. You do not give a command that you cannot enforce.
You will need to up the training on both dogs. Having two dogs is not twice the work, it is more like thrice the work. Because you have to train each individually, and then in tandem. And if you are worried about them attacking each other, then put muzzles on them and work them together.
LOL! one day I was at the vet with a pair of bitches, littermates, and one started to snark on the other, and I whipped two muzzles out of my pockets, and had them on those bitches so fast their heads were spinning and the people behind the counter were roaring with laughter. I don't play. I don't want stitches, and I want them on the dogs even less.
Exercise, BONUS!!!! You get skinnier, because both dogs need exercise and it should be done singly. If one has more energy than the other, take her on walks where you use her body more than yours, have her run up steps that you don't -- stuff like that, work on obedience during your walks.
It's basically my personal formula: Management, Leadership, Training, Exercise, and Socialization -- in that order. Only you don't need the socialization, because whoever said it, is right, same-sex aggression is almost always inter-pack aggression and does not translate to bitches outside of the pack. Which makes perfect sense, it is a pack order thing.
By respecting the natural pack order in the bitches you can reduce incidences between them significantly. Most folks just have a hard time with that. Because they apply human thinking to this. They feel that if they are petting the shepherd they have to pet the lab, the same amount of pets, or pet the lab first half the time. And what happens is WWIII.
If you have young children, rehome one of the bitches. Same-sex aggression CAN cause injury and emotional injury to children. No child should watch a bitch tear into another bitch, both of which the child loves. Most children will rush in and try to protect one of them from the other. And the one they are protecting are just as likely to bite them because they are fighting for their lives. And it can be misdirected aggression or just accidental, they were trying to bite the other dog and the kid got in the way. No kid should live in a house with bitches that want to kill each other.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.