There are numerous issues with clay based litters, which is why Tail Blazers chooses to carry other types of litter. Clay litters are produced from environmentally harmful strip mining. In addition, when your cat scratches in clay, harmful dust particles become airborne and inhaled, causing your cat potential lung problems down the road. And lastly, when a cat ingests clay when grooming its paws, there is the potential for the clay to become impacted in the bowel. All the litters we have at Tail Blazers are environmentally friendly and non-harmful to your cat!