My horse's feet no longer crumble when nails go in

I use Robust Hoof supplement as my horse tends to get 'crumbly' hooves. His feet have much improved since using this supplement - my farrier is very impressed. My Farrier used to struggle when fitting shoes as Tobi's feet tended to crumble as the nails went in. Not any more!
Susan Glormey - Robust Hoof