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 Dalmatian dog. The children started to discuss the dog's duties.
"They use him to keep crowds back," said one youngster.
"No," said another, "he's just for good luck."
"I know!" said a third...
"They use it to find the fire hydrant!"