I THINK ITS JUST A DOG THING CAUSE EVERYDAY WHEN I CLEAN OUT THE HORSES AND COWS STALLS ALL OF MY DOGS DO THAT ANY DOG I HAVE EVER OWNED HAS DONE IT AND THE HORSE HOOF THING I ASKED MY FARRIER WHY THEY DID THAT HE SAID THAT THEY JUST LOVE THE TASTE ITS JUST LIKE A BONE FOR THEM HE SAID HE HAS NEVER MET A DOG THAT WOULDN'T EAT THEM