I've recently started adding a tiny bit of peat to the litter boxes. I was told that might not be a good idea, due to the potential dust, but the pellets turn into sawdust, which is dusty anyway and the peat is slightly moist, not dusty. So, I'm waiting to see how that works out.
My dutch doe, previously very good about her litter box, has started digging everything out of it, but then she's likely pregnant now. I had to remover her litter box completely. She was making a terrible mess. :roll: