A school teacher was driving a bus full of kids when a fire truck zoomed past. Sitting in fire truck was a Dalmatian dog.

The children fell to discussing the dog’s duties.

“They use him to keep crowds back,” said one youngster.

“No,” said another, “he’s just for good luck.”

A third child brought the argument to a close. “They use the dogs,” she said firmly, “to find the fire hydrant.”