The basic rule here is scoop the poop. If the dogpark doesn't have bags or scoopers, please bring your own. If you find poop from other dogs, please kindly tell the dog's owner. If you don't know where the poop came from, please kindly pick it up. Please supervise your dog.
Many dog fights occur because of unsupervised dogs.
There have been complaints bout dogs being attacked by other dogs. Only you know your dog's behavior and only you can prevent problems by anticipating trouble. Only you know when your dog is being a threat or being threatened. Please do not leave your dog unattended. Again, because this prevents any problems.