Very nice!

I really liked the "whirlwind of insanity masquerading as a horse" line. That whole paragraph. The concept of recurring dream. The father's advice which is vaguely fitting for horse riding, but which in the context of the prompt gets a new, more sinister meaning.

It really hooked me. I stopped to re-read it a few times and thought "wow, it's going to be good". And I was not disappointed :) Well done!