The fireman's doggie

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 hydrants."