The chorus that I posted above had one line from an earlier version next to a line from this one, so you may have noticed it didn't rhyme.
Here's the current version:

"Who Put The Mini Horse In Red Silk Lacy Trousers? Words: Jeanene Pratt Tune: Who Threw The Overalls In Mistress Murphy's Chowder

George L. Giefer

Jen and Cherry threw a party up in Ellensburg last week,
Everything was rowdy, Jen and Cherry are not meek.
The catters gathered round to sing, to party 'round the clock,
Only then what happened next, it was an awful shock!
When Jenny Calhoun brought the entrees out,
I fainted on the spot.
I saw a horse with panties on her bottom -- kid you not!
Ol' Amos, got indignant and his eyes was bulging out.
He jumped down off the barstool, and began to loudly shout:

"Who Put The Mini Horse In Red Silk Lacy Trousers?
What's next? Some lipstick, high-heeled horseshoes and face powder?
It's a Washington disgrace! You would think she owns the place,
The Mini Horse In Red Silk Lacy Trousers!

Amos checked the pants for fingerprints or labels from the store.
Derrymacash and Mousethief swore they'd ne'er seen them before.
They were plastered and their vision blurred,
And down upon their knees,
When they spied the name "Provocateur" so clear that all could see!
When Jen and Cherry heard the news,
They shouted out, "Oh, rot!
We bought them on the 'net, you see
Not knowing they were 'hot'!
But you'll never find a better friend than our guide horse, little Rose.
So we sang a tribute to the horse, and this is how it goes:

"We love The Mini Horse In Red Silk Lacy Trousers!
Rosie's such a cunning guide that no town should be prouder!
So it's reallly no disgrace if she thinks she owns the place,
The Mini Horse In Red Silk Lacy Trousers!