Originally Posted by FriesianSH
I'd be cautious about sanding hooves. The hoof has it's own natural outer coating that helps the hoof retain moisture to keep it healthy and pliable. Sanding the hoof removes that layer and can lead to bigger problems.
I was about to type the same thing. We already do to much to improve our horse's coats, hooves etc and I think sanding is one of those things that would be a little to much.
I would stay away from it.