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 began 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."