"That's easy, he's a little person with a speech impediment."
So, the little person shows up, and the guy asks him if he's looking for a male or female horse.
"A female horth."
So he shows him a prized filly.
"Nith lookin horth. Can I thee her eyeth"?
So the guy picks up the little person and he gives the horse's eyes the once over.
"Nith eyeth, can I thee her earzth"?
So he picks the little fella up again, and shows him the horse's ears.
"Nith earzth, can I see her mouf"?
The rancher is gettin' pretty ticked off by this point, but he picks him up again and shows him the horse's mouth.
"Nice mouf, can I see her twat"?
Totally mad as fire at this point, the rancher grabs him under his arms and rams the little person's head as far as he can up the horse's requested part, pulls him out and slams him on the ground.
The little person gets up, wiping his eyes, sputtering and coughing.
"Perhapth I should rephrase that --- Can I thee her wun awound a widdlebit"?