Help. I have a 15 month old female GSD. She has never been afriad of anything and still has no fear. We have been going to the dog park since she was a puppy every day. She has always played very rough with the other dogs. Now that she is really big she is playing really rough. The first thing she does when she sees a dog is the hackles go up and she runs up and puts the dogs neck in her mouth. I do believe she is playing. But she really scares the other dogs and their owners. She is growling while doing this, she has always been very vocal while playing. I would like to stop this rough play if I can. At night when I go to the dog park she plays with the only other dogs that go at night and the 3 of them all play very rough. Sometimes though she provokes a fight because she is too rough. She also has issues if she sees a dog from the window at home or while in my van, she goes into attack mode. Her parents are both from Germany and trained in Shutzhund, I wonder if this is what makes her so high strung? Any advice anyone can give me would be very helpful.