Originally Posted by Arksly
In dressage they are looking for a horse with a relaxed tail which usually means that the horse is through and supple.
"In dressage"? This horse was one of the uppermost dressage horses at that level at the time, so apparently "they" don't mind the tail swishing. I've always understood tail swishing to mean your horse probably isn't particularly happy, too, and watching this video is the first time that I'd heard an equine professional (the announcer) proclaim it as meaning how happy she is. I wasn't sure what to think... but it sure was pretty!