I wasn't really sure which story would benefit most from this knowledge, so instead i'm just putting it here for you to use as you wish: Horse legs are actually hyper specialized fingers, and this is why when they break the horse has so many issues, as there is very little muscle in fingers, just a lot of tendons and cartilage.
So yeah, horses don't have legs, they have 4 giant fingers.
So yeah, horses don't have legs, they have 4 giant fingers.