Can I train dog aggression out of my 2yr old GSD at the dog park? I’ve tried many methods from ecollar, prong dollar, choker, treats, redirecting to her favorite toy, redirecting to a new toy, and plain positive reinforcement. I’ve been doing this for months and the most progress I’ve made is that she will sit on command if she’s on a short leash and the other dog is a ways away even though she can still see it. It’s not easy to train her not to be dog aggressive in a public place because other people become scared. Is the dog park a good place? She went most of her early puppy life and had no problems off leash. Even when on leash it’s all for show. She’s super friendly and has NEVER been in an altercation.