I agree with bullypaws. Dog parks are no place for pitbulls. It is an accident waiting to happen even when you are watchful of your pittie. It only takes a second for something to happen. It may not even have been started by your dog but it will be blamed on the pittie. You will never know when or if your pittie will develop DA until it happens. Even if he hasn’t shown signs of it yet, that doesn’t mean tomorrow will be the same. Long walks, controlled pittie play dates with responsible owners are a better avenue.