Most horse owners will probably admit that there are times when we become convinced that horses must be the stupidest creatures on the planet. Getting spooked by, and whirling to run away from a rock on the trail, but aren't in the least bit phased by the appearance of a black bear. They will ford a river without qualms, but will go to great pains to avoid a mud puddle. Jump ten feet sideways at the appearance of a cat on the rail in the arena. The list goes on.
Truth be told, they are incredibly intelligent. And, provided that you go about things correctly, they tend to be pretty willing to learn. Case in point:
To be able to teach a horse to do that takes skill that I doubt I will ever possess. The style of riding is called dressage, and while I have no desire to be a tally ho rider, I am nonetheless impressed. And it looks so effortless, I believe, because the mare knows her business. And I find it doubtful that the horse is an unwillning participant, else it would be nigh impossible to keep that up for over six minutes.