We dont have dog parks here in Columbus and we have a leash law if we are in the Public park all dogs are to be on leash, but there is always someone who ruins it for us. Like the other day this man did not have his dog on a leash and it ran up and jumped on an elderly man causing him to fall and break his arm. I would be rude to this person, because very soon if the dog keeps jumping on people some one is going to get hurt. and even though the dog is friendly a fall could injure someone badlly. Is there someone with authority that you could tell. I hope that there is someone to help you out. Good luck