So we have an amazing dog park that our pup loves. There is an owner that brings their aggressive dog, it barks and bites, and the owner does nothing. This aggressive dog for some reason loves to be this way my dog. We've had to leave the park 4 times because of this. Even when we are leaving with the leash on our dog the other dog is barking and trying to bite her. I don't know what to do. There aren't any other good dog parks around and we're not the other people who have had this occur. I'm not the type of person to say something but I'm getting really frustrated. Any advice?