Trust me. I feel your pain. Much as I love the socialization benefits of dog parks, I can't help but gripe at some of the truly idiotic owners.

BEFORE people go to dog parks, they need to understand dog behavior and the risks involved. For example, if the park is clearly divided into a big dog section and a small dog section, bring your dog to the appropriate section. You don't see Great Danes lounging in the small dog park. Likewise, fluffy-white-rabbit-looking dogs like Shih Tzus don't belong in big dog parks. Furthermore, people need to understand what is play behavior and when it will escalate into a fight. Unfortunately, most park goers in my area are either hypersensitive or completely apathetic. In your case, the owner definitely needs a bit of schooling on that part.

Sorry you had a bad experience Noba's Mom, but we all feel your pain. You did the right thing by taking yourself out of the situation. There isn't much else we can do besides educate.