First, do not get rid of your instincts. There is no knowledge behind instinctual intelligence so “not thinking” is actually a good thing. In my profession, I only use “thinking” when I have to explain something to the human. With dogs, it’s all about instinct and energy.
Here’s what you need to keep in mind. You can stop a dog fight by observing body language. This is what I do with aggressive cases – stop the bad dog behavior at the very instance you see it about to escalate. But if that’s not possible, during a dog fight, once there is one occurring, stay calm and observe who or which of the two dogs is at a higher level of intensity. That’s the dog I’m going to focus on. Then you need to step in to give that dog the right touch – this means the ribcage area. The reason is that this forces the dog to open his mouth and let go of his hold on the other dog during the dog fight. It’s about timing too, so look for the right moment and then act quickly.
You can use a loud, strong voice or grunt directly at him and pull back from the back of his neck and collar – not from the top, but from the back and pull up, otherwise he can interpret this as you getting into the fight as well, and this is when the dog can turn on the human and bite him because his level of intensity is so high, he doesn’t think “oh, that’s the human.” You’re just another dog in the fight and before you know it, the dog you’re trying to defend is coming after you.
Whether it’s a big dog or little dog, the technique and method is the same. Do not scream repeatedly unless you are calling for help. Sometimes people are not going to help, so don’t expect that everyone will have your ability or good will. Most importantly, be quick, stay mindfully aware, emotionally in tune, and remain calm