Siren with a fire engine

A fire fighter was working on an engine outside the station when he Noticed the little girl next door in a little red wagon with little Ladders hung off the sides and a garden hose tightly coiled in the Middle. The girl was wearing a fire fighter's helmet and the wagon was Being pulled by her dog and her cat.
The fire fighter walked over to take a closer look. "That sure is a nice fire truck", the fire fighter said with admiration.
"Thanks" said the little girl. The fire fighter looked a little closer And noticed the girl had tied the wagon to her dog's collar and to the Cat's' testicle.
"Little Partner", the fire fighter said, "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 too, I think you could go faster."
The little girl replied thoughtfully, "You're probably right, but then I Wouldn't have a siren."