A nursery school teacher was delivering a station wagon full of kids home one day when a fire truck zoomed past. Sitting in the front seat of the fire truck was a Dalmation dog. The children started discussing what the dog's duties might be."They use him to keep crowds back," said one youngster."No," said another, "he's just for good luck." A third child concluded. "No silly, they use the dogs to find the fire hydrant!"