Litter tracking occurred at a far lower volume than we saw with lightweight litters like those made from grass and walnuts. A 15-pound bag lasts our two-cat household for over a month. However ...

We asked veterinarians and cat behaviorists to find out what to look for in a natural cat litter. Then we tested 18 different corn, wood, grass, wheat, walnut, and tofu formulas for this guide.