I had a female Malinois who was mostly afraid of other dogs so I took her to a low key (not many dogs) dog park. this was probably 10 years ago. there were mostly little dogs there at the time. One came up to her and scared her. Then she went up to one and sniffed it and WHAM, knocked it over. She was just playing but it was not very "nice" playing and I had her OFF leash. then one by one, Wham, Bam, knocking dogs over like they were bowling pins. OMG!!!! I got her to come to me and hooked her on her leash and got out of there before someone hung me. I was so embarrassed. I told my husband like on the Ikea commercial, "START the car, START the car!!!!" My hopeful idea turned into a bad one. Never in my wildless dreams did I think that would happen! Someone there had told me to unleash her because with me holding on, she was feeling the tension and becoming more afraid. Well, that didn't work out so well. No one got hurt but everyone that she could get to got knocked down. She was SO FAST being a Mal, I don't even think a big dog could chase her down to put her in her place. She was off like a bullet. Recall, yeah, where did my recall go??? Out the window for sure. thought it was solid. Anyway , I don't go to dog parks anymore because I figure that could happen to anyone. At least mine wasn't aggressive as in wanting to fight. But I felt like I had the little gang banger.