Do not get your hands in the mix... you will get bit and it won't be pretty. If you are on your own property turn the garden hose on and spray them. If you are out walking your dog should be on leash... pull on your dog.
Attacked is an article with a lot of details about how to stop a dog fight. They offer a one person and two person approach. Clearly the one person approach is going to be a lot more difficult.
The most important thing to remember is keep your hands and other body parts out of the fight, its hard to do because it is easy to react when you see your pet being attacked. howtoguides365.com/how-to/dog-fight.
As mentioned, dogs fighting is not a pretty sight, and depending on the types of dogs that fight, it can be dangerous to meddle. If your dog is obedient and is used to follow verbal commands (as all dogs should...) then it's possible to stop a fight when it just starts with a very hard and loud stop command. That means you need to be observing your dog and read it corectly, so that you can see what's coming.
The short spell between the dog either stopping or at least holding off for a short second or two is the time you need to act and grab your own dog. Collar is OK at this stage. The other dog will likely not really think that the fight is over, sou you need to stand between your dog and the other dog and tell him to get lost in no uncertain terms.
A human facing a dog and fending it off will deter most dogs from attacking again. This approach means you need to be physically strong enough to hold your own dog back from re-attacking once you have taken hold of the collar and it also is only recommended if you are sure of sourself and can send off the other dog with your physical and (very important! ) mental presence.
A small person can build up enough mental pressure for a dog to retreat too. If you are not sure that you can handle the dog fight in this way, better step back and wait for it to be over. It's rare that dogs will fight to the end, i.e.
Until one of them is dead. Usually dog fights are short and violent, once the biting starts, but one will most often let off and leave, when he feels that the other is much stronger. My take on dog fights is to prevent them from start.
When I walk my male, he gets attached when other dogs are approaching and I avoid contact with dogs I don't know. Also I don't tolerate my own dog growling or barking at other dogs. He knows that we walk past other dogs without agression.
If a dog is trained that way and you keep him on the leash in situations that could lead to a fight, you and your dog are a lot better off, and others are grateful for it.
You can also use a broom (without hurting any of the animals preferrably) or spraying them with the water hose. Just don't get into it yourself unless you understand you could be seriously injured.
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