With this new cat, I now have a problem. I have to use non-clumping, unscented litter because Onsa has allergies to any perfumes. But now, after Kumal uses the litter box, he starts a sneezing attack and throws up. I'm thinking it's the dust in the clay litter. I use a low dust litter, but let's face it, clay is dusty. So what I'm thinking is to line the bottom with clay, taking it outside and moving it around to get most the dust out, and filling the rest with pine shaving horse bedding ( I still have 40 cf) an 80cf bag is less than $10. I have looked up if this will cause any problems to my cats, and couldn't find where it will. Does anyone have experience or concerns about using this? Note: The boxes get dumped, cleaned and refilled every day.