I put a mineral brick (pictured) in Spot's feed bucket. If I put it in a holder, he destroys the holder, so I found an alternative. This kind of helps him eat slower, too. Well... he tends to go through the brick pretty quickly and even though I don't replace it right away, I worry about overindulgence. Should I get one of those "Stall snack" things that hangs? Make it a challenge for him? Or does he even need it? Are there any other ways I can pace his consumption of it? Thanks!