my son in college and his friends were given 2 puppies at, of all places, a gas station. Of course, there is no history about these dogs and i told him i would keep them until he moved into the apartment with his friends. These pups are about 10 weeks old and they always seem to play fight until it seems to get real. I need to know how to stop them because they are driving my wife and me crazy.
If you do a search on raising siblings you will find some helpful info and why its usually not a good idea to get two pups from the same litter. You are going to have to start separating these pups. Do you have two crates?
My litters do the same and sometimes the growling sounds vicious, but I have read it is normal puppy behavior and important for development. You can muzzle them if you wish. If they are two of the same sex, they may be determining dominance, but at their age, it sounds more like playing.