a horse cannot be replaced so easily, I suppose. There is no way that a rider would compete with a different horse.
I was thinking of picking a different pair altogether.
Some of these professional riders ride several horses in one event.
I think almost none of them (except the princess) own their mounts. They keep them and ride them, but someone wealthy — like Ann Romney — owns the horse.
Sort of like the musicians who play those rare and ancient instruments.