It happened about 20 years ago, when the event was at Riverfront Park.
There were a few sheep. And a fellow was demonstrating herding with the help of a border collie.
Suddenly a preschool boy started running toward the action. The dog turned and fixed the lad with a firm but nonthreatening gaze.
The little kid understood the border collie's instructions immediately. He froze in place. Then he retreated from the scene and the herding demonstration continued.