What they did before blue reflectors

Years ago (before enclosed cabs on fire trucks) a fire truck came whizzing past a nursery school.  Sitting on the front seat was a dalmatian.  The children started 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 dog”, she said firmly, “to find the fire hydrant.”