Ahahaha, okay, it’s good that I wasn’t paying attention to the tags (or apparently anything). When I got to “His arms were too short,” I had a serious, “Wait, whaat?” moment.
If I were being a pedant, I would point out that there were no horses in the Pleistocene, but maan… there’s never a bad time for dinosaurs. Story-wise I think it could use some smoothing out so it flows a little better. But man. Dinosaurs.
Nice work again! The backstory with the horse was very well done, but for this format it might not be necessary. Try and focus on the here and now of the story unless prior exposition is an absolute must.
There’s a couple of typos (he’s a Nobe knight now and again), and an awkward pronoun change (“He had gotten IT from his father when SHE was just a foal”) that you need to keep an eye out for. Also, another line break between paragraphs would keep it easy on the eyes, too.
The thing I admire most about this piece is your ability to take an absurd topic and play it utterly straight-faced, which is what makes it both compelling and a little funny!
lostsalient 
AdorableBlanket 
YaYa