If they are unneutered get both neutered. This can cut down on their need to establish dominance with one another. Here are some great tips on preventing fights:
Tips for avoiding fights:
* Behavior modification work with your dogs is essential. Be sure to watch for next week's tip, "Aggression Between Dogs in the Same Household."
* Never allow any dog to achieve dominant status over any adult or child. If dogs always know their social ranking and are never allowed to challenge people, they will usually be good family members, advises Gary L. Clemons, DVM.
* Feed dogs in separate areas, rooms or in their own crates.
* Do not toss treats out to dogs. Instead, have each dog obey a command, such as sit, individually, and give the treat right after he/she obeys.
* If any chance dogs will fight over toys, don't give the dogs toys unless they are in separate locations.
* Do not give dogs toys that fanatically excite them.
* Carry a small, automatic umbrella. You can pop this open between your dog and an incoming one of you fear a problem. It provides a surprise and a hiding place.
* Some dog handlers carry water pistols and water cannons.
* One Great Dane owner uses a cookie sheet to deter dogs from engaging in a fight. She has slipped the pan between the aggressing dogs, as well as banged on it to create a distracting noise.
* One multiple dog owner always keeps a sturdy buckle collar on the dogs, which provides a sturdy handle if needed.
* Don't permit tug-of-war or aggressive wrestling. These games can quickly escalate into a fight.
* Don't give dogs rawhides, pig hooves or other highly coveted goodies. At the very least, don't allow dogs free access to them. The dogs are likely to fight over them.
Hope this helps!