A fire fighter is working outside the station when he notices a little girl in a little red wagon with little ladders on the sides

a garden hose coiled in the middle, and wearing a fire
fighters helmet. The wagon is pulled by her dog and cat.

The fire fighter takes a closer look. "That sure is a nice fire truck," the fire fighter says with admiration. "Thanks," the girl says. The fire fighter notices the girl has tied the wagon to her dogs collar and to the cats testicles.

"Little partner," says the fire fighter, "I don't want to tell you how to run your rig, but if you were to tie that rope around the cat's collar, I think you would go faster."

The little girl replies thoughtfully, "You're probably right, but, then I wouldn't have a siren."