All great references, but the original post was inquiring about a song about a horse named Napoleon "all on account of his bone-e-parts". This Napleon song is a different one, folks. My grandfather used to sing it and he is originally from Syracuse, N.Y. It mentions "the Hambletonian" which is a long-standing harness race in upstate New York. The song follows a medium galloping beat. The lyrics that I learned are:

I had a horse and his name was Napoleon
All on account of his bone-e-parts
He was the sire of an old Hambletonian
The son-of-a-gun would never start

He was so thin you could see right through him
Hair on his eyes as fine as silk
I drove him on my milk wagon
When I wanted him to stop I'd holler milk

Then one day up-on the street
I met a rube with a rig so neat
Says I old rube I'll bet you a five-er
I can beat you down the street

So off we started down the street
You can bet yer life twas a live-ly pace
Sure as a sinner, I was the winner
Till someone hollered, MILK! And I lost the race