There's a couple of others that haven't been mentioned such as "Zebra Dun" and John Warner's "Horses of the World" and "The Farrier's Trade."

Then there's"I Can't Get Offa My Horse aka Glue in the Saddle" which has this touching final verse:

When I die and go to heaven,
There to meet with our savior true,
Just dig my grave and build a coffin,
But you better make it big enough for two!

Then there's "The Ballad of the Cowpuncher" which in the final verse contains the immortal lines:

I've been lonesome in the saddle, ever since my old horse died,
And sometimes, when it's late at night, I dream she's by my side,
Them nightmares keep me up all night and caused me for to roam,
I am an old cowpuncher and a long, long way from home.

Cheerily,
Charley Noble