Malone & Emerson are trying to assert their dominence over one another. It sounds to me like they are on equal terms, and need to work it out between them, who will be TOP DOG? It may take a while, but eventually one will understand where they stand in 'the pack'. Are they both fixed? If not this can cause extra aggression between them. 1-800-321-PETS is a low cost spay/neuter program run by Friends Of Animals. I highly advise getting all dogs altered males & females. It cuts back on aggression, territorial disputes, cancers associated with unaltered animals, and makes them easier to contend with.