My grandfather would always sing this song. I found your post trying to determine if it was a real song or had he made it up!

I had a horse his name Napoleon,
Noted for his bony parts.
He was sired by an old Hambletonian,
Damned by everyone that drove his carts.

One fine Sunday, while I was out riding,
Along came a gent with a rig so neat.
He said to me, "Come along, little Ruben.
We'll have a race right down the street."

Down the street we went helter-skelter,
Down the street at a terrible pace.
Sure as a sinner, I was coming out a winner
When a cuss hollered "MILK" and I lost the race.