Originally Posted by Shade
It's always easiest and probably best to take the high road in those types of situations, either leave or remove your dog to another section and keep it away from hers. There's no real way to "win" the argument and in the mentality of promoting peace for all people at the park try and stay away from fights. If the person was kicking your dog in a corner and not stopping of course stand up right away for the dog, but for little spats like that it's really not worth the breath or aggravation.
I think telling my dog "NO" in a situation that he (and I) think is correct is just going to make him think hes being a bad boy. She ended up leaving as I started to walk up to them, which left me thinking I did something wrong.