I have been using World's Best Cat Litter (multiple cat formula) for a little over 2 years now, and firmly believe it lives up to its name. I started using it for both my cats and my ferrets after realizing that my ferret boy is determined to periodically scale the walls of the storage bins I use for cat boxes and go diving (GROSS!!) I then had to find something that was ferret-safe and that I could live with as well. It is 100% corn, TRULY has almost zero dust, and clumps better than anything I have ever used! Fran [Posted in FML 6443]