I have two dogs who keep fighting how do I stop them?

I'm not sure if this will be the best answer, but I . I volenteer for a dog trainer for some time now and I learn new things everyday. One was that you shoukd never come between two dogs that are fghting. What the trainer did was put a shock collar on one of the dogs, probably the one who starts it. Put it on LOW shock and if they start fighting, give a zap. I know that you might think that this is animal cruelty, but it doesnt hurt the dog at all. This gives him the reminder "Hey, dont do that, it doesnt solve things!" Soon it should show affects, and soon the dog will feel safe and comforted in the collar. This is true and I have tried it on one of my dogs. I hope it does the same for you! Hope it helped! Good luck!