"Fireman" joke

A fire fighter was working on the engine outside the station when he noticed a little boy next door in a little red wagon with little ladders hung on the side. The boy was wearing a firefighter's helmet and had the wagon tied to a dog and a cat.

The firefighter said, "Hey little partner, what are you doing?"

The little boy said, "I'm pretending to be a fireman and this is my fire truck."

The firefighter walked over to take a closer look. "That sure is a nice fire truck" he said with admiration.

"Thanks mister" the boy said.

The firefighter looked a little closer and noticed that the boy had tied the wagon to the dog's collar and to the cat's testicles. "Little partner," the firefighter said, "I don't want to tell you how to run your fire truck, but if you were to tie that rope around the cat's collar, I think you could go faster."

"You're probably right, mister" the boy said, "but then I wouldn't have a siren."