Amazon.com : Creative Science Nosorb Non-Absorbent Cat Litter | 6 oz | Easily Collect Urine Samples from Cats : Pet Supplies
Amazon.com : KIT4CAT 2lb Hydrophobic Cat Litter for Urine Collection, Hydrophobic Sand Urine Collection Litter Kit I Collect cat Urine Sample for Test (3 x 11oz Bags) : Pet Litter : Pet Supplies