Its name is Capernicus (often pronounced Caper Knickers), and it can dance, of course. And do tricks, sometimes (okay, once) involving the mayor of a Hungarian town. And it gives children rides.
Sometimes, the horse is a cow. We call our cow Pat. Our cow Pat has legs that are remarkably similar to the horse’s legs. The two are never seen in public together: draw your own conclusions. Pat does exactly what the horse does, but with udders.
We can’t really explain it. When you’ve seen it, you won’t be able to explain it either. Best just to watch the videos (click on the images):