I use to work at a dog day care and one thing we were trained on is breaking up dog fights / bites.
First grab the dog by the back legs and wheel barrow them back. Keep holding the legs up so the dog canβt get any leverage on the other dog.
If your dog still wonβt let go, you need to slide your hand under the collar (behind the neck), pull up and twist the collar and choke the dog until they let go. If the dog doesnβt have a collar, use a leash. (Do this too long and you can end up unaliving the dog.) Sounds intense I know but itβs a life saving move all dog owners should know.