Oh no I'm sorry you're going through this with your babies. I don't have any experience with this, my two are siblings, and are litter mates, so have been together since they were born. Hopefully a member with some experience with fighting will come along soon and be able to give you some suggestions or advice. I hope you find a solution. Good luck. Sending love and hugs. Have you ever tried some training with your dogs? Maybe a trainer could help, or give you suggestions on how to change the behaviour.