I haven't been to any pt meetings/the ohio bark park but around here, you don't need shot records. But it's a smart thing to have (the shots..not the records lol) because dogs will be meeting and greeting other dogs. In dog parks, owners MUST clean up after their dog's waste. No one likes stepping on dog do-do. If you know that your dog is dog agressive..it's not a smart thing to let the dog off leash with other dogs around. The dogs would be closely watched I'm assuming...so any fights can be broken up.