Yes, his back is hollow. A low head does NOT mean that his back isn't hollow though, and this us where a GOOD riding instructor comes in; they have to be able to tell 'roundness' [good] from 'headset only' [bad]. The key is not focusing on the head; the head is unimportant. When the horse's body is correct, the head will automatically fall into place. When searching for a dressage trainer, ask them questions about their training. Avoid people who use draw reins or other ridden gadgets; sure they will force the horse's head down, but it will not be correct. You want to hear terms like 'riding the hind end,' 'riding back to front' and 'riding round.'
I'm a jumper rider myself, but I learned years ago that dressage ridden properly steps up your game in almost any discipline.
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