How would a dog musher break up his dogs if they are fighting?

Seen a few dog mushers on T.V, noticed that they have quite a few dogs to pull their sled and wondered how would the musher break his dogs up if they started to fight? there would be at least 6 dogs fighting if they all were in on it and was curios to know if there was a way to stop them if they did. i have enough trouble with only 2 dogs.