Safely stopping a dogfight

Keep your cool you have a job to do.
Do not waste time screaming at the dogs. It hardly ever works.
Your goal is still the same; you must break up the fight without getting hurt.
Go get a leash (allow the fight to continue while you do this).
Dogs are almost always locked onto one another. Walk up and loop the leash around the back loin of the dog by either threading the leash through the handle or use the clip. I prefer the thread method.
Now slowly back away and drag the dog to a fence or to an object that you can tie the leash to. By doing this, you effectively create an anchor for one of the dogs.
Then walk around and grab the back legs of the second dog and drag it away from the dog that is tied up. Remember to turn and circle as they release.
Drag the dog into a dog pen or another room before you release the back legs.
Go back and take the dog off the fence and put him or her into a dog kennel.
Sit down and have a stiff drink (or two).
People talk about using cattle prods or shock collars to break up 2 pets that fight. I can tell you that many times this is not going to work. The electric cattle prod or electric collar will only put the dogs into higher fight drive. When they are shocked they will turn and bite the prod, or when they are shocked they will think the other dog is causing the pain and they will fight harder. An electric collar is best used in conditioning training, but not during an actual dogfight.