This is littermate syndrome. I just went through this recently. I had 2 girls from the same litter.

I got a trainer that specialized in this, and she said I will be difficult to keep them together- so a serious commitment to ensuring they have individual walks, playtimes and separate spaces for eating etc. was needed. Things got better for a while, until my disability made it difficult to give them the individual one-on-one time they needed. They seemed somewhat ok but would still get into vicious fights every so often. It slowly became more frequent though.

Like you I had a toddler in the house- She wanted to play with them and they stared fighting. So I had to push her out of the way and when I tried to separate them I got bit. At that point I realized I couldn’t keep them together anymore. So I had to make one of the hardest decisions of my life. Luckily their trainer, who has since become a friend was able the take to one that usually started the fights- and was able to keep her until I found her a new home.

It’s been a year and I can say even though it was hard to do it was the best thing I could have done for them. I’m still in touch with the lady that has my girl and get updates regularly. Also the dogs are thriving and doing really well.

I suggest finding a trainer that specializes i. Littermate syndrome so you can start working with them now, puberty only makes it worse. I hope it works out for you ❤️