How deep should you fill your cats litter box?
Every cat has a preference. To figure out what your cat likes, fill the litter box about 2 ½ inches then tilt the box to the litter is deeper at one end (about 4 inches) and shallow at the other end (about 1 inch). Watch to see which end your cat uses, then fill the litter box to that level.
For more tips on caring for your cat's litter box, please read The Fine Art of Litter Box Care