Holly, thanks for your concern; however my ferrets do not butt-wipe in the litter box, they much prefer the carpet when they are out of cage. :) In the cage they seem to not butt-wipe after "box use". Don't remember brand or type of regular litter I had used. But in my case, I know clumping litter IS SAFE for ferrets as they do not embark on any of the bad habits associated with clumping litter. My point in my first post still stands not everything works the same for everybody or ferret. -- Tim [Posted in FML issue 3568]