My horse needs to do what I say.

Why?

Yet, why? isn't even the best question. Your horse needs food, water and sometimes shelter. But, if you are phrasing your wants this way, it WILL affect your results with your horse. And I am not saying that's in a good way. You want your horse to______! But, horse doesn't NEED to_____. Horse wants to ______.

As far as you're concerned, it may be safer for you, you will probably enjoy horse more, you may win more ribbons, if horse does what you say. But, that has nothing to do with horse's needs and as long as you think it, you are not working your way to the solution with the best results either in time frame or productivity.

Thomas Edison said, "There's a way to do it better. Find it!

Figure out how to keep your frustration over what you perceive horse NEEDS to do from getting the best of you. And, figure out how to get horse to think that it's a better idea if maybe he would consider doing 'it' like this.

Frustration never fixed anything.

Low level skills and knowledge aren't a big help either. Use Edison's line as a mantra.