[ZwHRoTTn]

Welcome. I changed your thread title and moved it to the General Dog Discussion. You should get more responses here.

First off, I'd look into getting this bitch spayed ASAP. I believe it's too late to have an emergency spay (aborting the litter), but this would prevent any further "accidental" litters. If the other bitch isn't spayed either that's something I would definitely be considering. If you don't want to spay, it's only responsible to keep the bitches INSIDE when they're in heat and they only go out leashed to go to the bathroom. It's usually just much more convenient to spay, especially if you aren't planning on breeding. The cost of a spay is much less than the possible vet costs you can incur from complications during the whelping, taking care of the puppies and possibly caring for them indefinitely if you can't find homes.

Perhaps others who have had pregnant bitches can help provide some insight as to whether this fighting could be hormone related, I would imagine with two possibly intact bitches there could be a link but, it is 100% possible that they need to be separated from now on and they should absolutely be separated when unsupervised. Same sex aggression is most common with any breed of dog. Typically opposite sex gets along better, but even then there are dogs who just cannot be trusted.

Hope others have some more insight for you.