You can get one dog to stop chewing on the other dog by offering dog training. Whenever a dog bites the other, you should mimic its mouth using your hand and slightly press its neck or command it to stop in order to send signal that it is wrong to bite. Dog obedience training will be needed so as to stop the behavior. For more information, you may follow this link; http://www.dog-obedience-training-review.com/how-to-stop-a-puppy-from-biting.html.
Buy a shock collar and shock the dog on a medium setting. Let the dog relate hurting the other dog with the static. Do not yell at the same time. You don't want your puppy doing the same behavior when your not around. Leave the collar on for day time for three days. You should never call your dog to you to discipline. The dog will eventually not come when you have that particular tone. Hope it helps