Are you SURE it's fighting though?
It might help us to see a video if you wanna take one. Puppies play rough and make a lot of evil noises when in reality, they're just play fighting. If you don't hear any yelping, then they're not hurting each other. You would think our dogs were killing each other by the noises they make, but they're just playing. You can tell when it gets serious and a fight is about to break out... one dog will usually stop wagging tail, mouth closed, and STARE at the other dog and then a fight will break. Like I said, if they're just growling, etc, they're probably totally fine.
I can't imagine two 8 week old pups legitimately fighting. |