First, neither of my dogs would ever be off lead in any kind of park. We usually don't even go to parks since we live in the country and can go walking down the road. When we do, we make sure we stay away from other dogs, because Angus would start a fight with ANY dog, just because, and Roxey, she is very dominate and is always the aggressor (mabye due to being raised with Angus since he is so much bigger than her?). Second, I'm pretty sure Roxey would run off without her lead on, guess it's just in her genes! I really wish we could go to parks and take them off lead, oh well.....