I just read on another site that clumping litter can be dangerous to our kitties. It is made of a clay substance that is made to lump when it gets wet, so that when they clean themselves the litter gets inside them and can cause intestine problems and the dust can cause breathing problems. Have any of you ever heard this before? I have used clumping litter since I adopted Max three years ago. Now I'm worried. What kind of cat litter do you use? Right now I use a litter box liner - clean the lumps out everyday - and replace the whole thing every other week. I've never owned an animal before Max and I'm not sure how you treat non-clumping litter. Do you change it everyday? I am quite worried now and would appreciate any imput. I wonder if I should call my vet and see what he thinks.