Dogs, like people, will not get along with every dog they come in contact with. You must not only be aware that a fight is not only something that could happen, it is inevitable. The trick is to know how to handle it if it does occur. If your dog is not involved in the fight, call your dog near enough to grab his collar if necessary and lead him away from the ruckus. Timid dogs will likely seek out their owners when others are fighting because they are scared. However, dog with a more dominant personality will be drawn to the fight to assert themselves as the dominant dog in the park. Remove your dog entirely if you believe this could be the case with Fido.
If your dog is involved in the fight, DO NOT scream or overreact in anyway. This will only raise the tension and make the dogs more aggressive towards each other. You should try to call your dog to you, loudly so he can hear you but not screaming. Do not insert yourself between the dogs. The only likely result of this action is that you will receive an unintentional bite from either dog. Most times, the dogs will resolve the issue on their own if the tension is not increased by the owners. The growling and flashing of teeth is alarming because it is meant to be, but will not usually result in serious injury.
According to the ASPCA, the best methods of breaking up a dog fight that does not resolve itself within a few seconds include making some sort of loud noise to distract the dogs or throwing water on the dogs. Sometimes the distraction from the fight is all the dogs needed to remember their obedience to their owners.
The most important thing is to keep a close eye on your dog. Know when playing turns into fighting, watch for signs of territorial behavior in other dogs, and be ready to leave the park when in doubt of a situation. Your safety, as well as your dog’s, is more important than a missed day at the park.