Devon Sinsley said:
Horses are the spawn of Satan.
I’m reminded of a Sherlock Holmes quote: “Horses are dangerous on both ends and crafty in the middle.” 
My first job out of high school was at a resort out in the back country. They had horses you could rent, although you had to have a “guide” go with you and it was set route. I used to do it as often as I could afford to. It was fun. However, the horses were mostly old, semi-retired, and could go the entire route without the rider doing anything. They were usually pretty anxious to get back to the stable, so the closer you’d get to the end of the ride, the faster they wanted to go!