I bought Milo another “Himalayan Salt Rock” since he loved the last one. This time though I bought the black one which is supposed to benefit their digestive system. I’m not sure if it does but Milo likes and it gives him something to do. Milo doesn’t just like it; he loves it! He was trying to push me out of the way while I was tying it up in his stall. I had no idea a salt rock could be so exciting! It has a weird smell though…but I guess salt rocks aren’t really supposed to smell delicious, huh? I got it for $14.95 + free shipping from Amazon (of course, I have a problem, I know). Now, I have a happy, happy horse!