At work we laugh about this and call it Kitty Roca!! 
 
 
What I have done - and Jeanie has never eaten it because we have always done this = is we have a domed litter box and it is up high. She could get into it, but doesn't....because it is hard to get at. And the fact it's covered I think helps......or my dog just doesn't have an affection for Kitty Roca - and I hope she never does.......cause that would be yucky - but also normal for many dogs 
