Damage Control: If There’s a Fight
Sometimes, despite your best efforts to monitor playtime, dogs get into fights. These scuffles often look and sound ferocious. The dogs might growl fiercely, snarl at each other, bark, snap and show their teeth. However, most dog fights don’t result in injury to either dog. They’re usually the equivalent of getting into a brief, heated argument with a friend or family member. Even so, if a fight lasts more than a few seconds, the dogs’ pet parents should separate them. Doing this can be dangerous. If you grab a dog who’s in the middle of fighting with another dog, she might startle and reflexively whip around to bite you. To reduce the likelihood of injury to all parties, follow these guidelines:

Prevent fights from happening in the first place by actively watching dogs during play. If you think things are starting to look a little tense, end play for a while by calling your dog to come to you. (Please see our article, Teaching Your Dog to Come When Called.)
Have a plan and don’t panic. Remember that most dog fights are noisy but harmless. If you stay calm, you’ll be able to separate two fighting dogs more safely and efficiently.
Before you try physically separating two fighting dogs, make lots of noise. Clap and yell. Consider carrying a mini-air horn or two metal pie pans to bang together. A sudden loud sound will often interrupt a fight.
If there’s a hose handy, you can try spraying the dogs with water.
If you’ve tried briefly (3 seconds or so) making noise but the dogs are still fighting, you and the other dog’s pet parent should approach the dogs together. Separate them at the same time. Both of you should take hold of your dogs’ back legs at the very top just under the hips, right where the legs connect to the body. (Avoid grabbing the dogs lower on their legs, like by their knees, ankles or paws. Doing so could cause them serious injury.) Like you’d lift a wheelbarrow, lift your dog’s back end under his hips so that his back legs come off of the ground, and move backwards away from the other dog. As soon as you can, turn your dog away from the other dog.
DO NOT grab your dog by the collar. It seems like the natural thing to do, but it might startle your dog and cause her to turn and bite you. This kind of bite is like a reflex that’s done without thinking. Many pet parents get bitten this way-even when their dogs haven’t shown any signs of aggression in the past.
After a fight stops, put both dogs on leashes and end the play session. Avoid giving the dogs another chance to fight. If the dog park is large enough, you can walk your dog to another area, far away from the dog she squabbled with. After she’s calmed down and relaxed again, try letting her off leash again to play with other dogs. If the park’s not that big, just call it quits for the day.
Article:
Dog Park Behavior and Etiquette Tips
WebMD Veterinary Reference from ASPCA Virtual Pet Behaviorist
https://pets.webmd.com/dogs/guide/dog-park-behavior-know-risks-rewards#7



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