I searched everywhere on the Internet "How to dismount a horse", and of course, probably same to you, nothing that you really wanted came up. For once, the Internet doesn't give all the answers.
So, I decided I would do with some tips, for once.
So, I downloaded Mo' Creatures and wanted to see what happens if I go on a horse.
The Internet wrote on Yahoo! Answers:
"All you need to do is press Shift to dismount a horse. Why is everyone asking?!"
The answer for that question is, everyone asks how to dismount a horse because apparently, the Shift key doesn't do anything! It's like drinking a cup a water.
But, I cannot tell you the name of that person, as I don't want to shame anyone.
But, after pressing all the buttons on my keyboard, I finally got to "F", which what dismounted me!
In other words, long story short, the answer to: "How to dismount a horse", is:
"You need to press the "F" on your keyboard."
Oh, and I don't need a thanks. Everything's OK already ^^