Cat Litter Types Compared: Clay, Crystal, Wood, Corn and Paper
Cat litter types compared (clumping clay, crystal, wood, corn and paper), with what Cornell and the ASPCA say cats prefer, what color-changing litter can and cannot tell you, and how to set up and clean the box.
AI illustration Start with what cats choose: the ASPCA says most cats prefer clumping, unscented litter of medium to fine texture, in a shallow layer. Everything else, from crystals and wood to corn and paper, is a trade between dust, weight, smell, price and whether your particular cat will accept it. The cat has the final vote.
This guide sets out the types and what the Cornell Feline Health Center and the ASPCA advise about the box itself. Preferences vary by individual; our cat breed guides cover temperament, not litter.
The Six Types
- Clumping clay (bentonite) - forms scoopable clumps around urine
- Non-clumping clay - absorbs, but the whole box is changed more often
- Silica crystals - absorbent beads
- Wood pellets - usually pine; pellets break down as they get wet
- Plant-based clumping - corn, wheat, walnut, tofu
- Paper pellets - recycled paper
| Type | Clumps | Weight | Breaks down after use | Texture |
|---|---|---|---|---|
| Clumping clay | Yes | Heavy | No | Fine to medium |
| Non-clumping clay | No | Heavy | No | Medium |
| Silica crystals | No | Light | No | Coarse beads |
| Wood pellets | No | Light | Yes | Hard pellets |
| Plant-based clumping | Yes | Light to medium | Yes | Fine to medium |
| Paper pellets | No | Light | Yes | Soft pellets |
Dust, odor control and tracking differ more between brands than between types, so read the maker’s claim for the litter in front of you.
1. Clumping Clay
The standard. It is the texture most cats accept, clumps make daily scooping simple, and it is sold everywhere. The costs are weight, dust in some brands, and the fact that clay never breaks down: it goes in the trash.
The plainest clumping clays are unscented and hard clumping, and makers describe them as low-dust and low-tracking; compare those claims on the bag.
2. Non-Clumping Clay
The original cat litter. It absorbs urine without forming clumps, so instead of scooping clumps you replace the whole box more often.
Its main use today is for young kittens. The ASPCA’s foster care guide specifies non-clumping litter for kittens that are learning to use a box. Ask your vet or the shelter when to move a kitten on to a clumping litter.
3. Silica Crystals
Beads of silica that absorb urine. They are light and are usually sold as low-dust; the coarse texture is the usual reason a cat refuses them.
Some crystal litters change color. According to one maker of such a litter, dark yellow to olive green is urine in a typical range, blue may indicate a pH consistent with urinary infections or a higher stone risk, orange may indicate an acidic pH, and red indicates blood. Note the maker’s own word: “may”. A litter is not a medical test. If the color changes, or your cat strains, goes often or cries in the box, call your vet - and a male cat that cannot pass urine is an emergency.
4. Wood Pellets
Compressed pine or other wood. The pellets fall apart into sawdust when wet, so many owners use a sifting box. Wood is light and breaks down after use; some cats dislike standing on hard pellets.
5. Plant-Based Clumping Litters
Corn, wheat, walnut shell and tofu litters clump like clay but are lighter and made from plants.
About flushing. World’s Best says its litters are tested sewer- and septic-safe, and recommends flushing only one or two clumps at a time. The same page notes that the State of California encourages putting cat feces in the trash and discourages flushing them. If in doubt, bag it.
6. Paper Pellets
Soft pellets of recycled paper. They do not clump and need changing often. Vets sometimes ask for a paper litter after surgery; follow the discharge instructions you are given.
Keeping Litter Off the Floor
Whatever you choose, some of it leaves the box on the cat’s paws. A mat in front of the box catches a good part.
Setting Up the Box
The Cornell Feline Health Center’s advice on house soiling covers the box as much as the litter:
- How many: as many boxes as there are cats in the house, plus one.
- Depth: unscented, finer-textured litter about one to two inches deep. The ASPCA says the same: one to two inches rather than three to four.
- Sides: low sides for young kittens, elderly cats and cats with mobility problems; bigger boxes for large cats.
- Lid: most cats favor uncovered boxes, because covers hold odors in.
- Where: quiet, private, away from the feeding area, and reachable around the clock.
Litter box furniture
Enclosures that hide the box, such as a cabinet, a bench or a planter, are sold for homes where the box would otherwise be on show. Before buying one, weigh it against the Cornell points above. An enclosure is a covered box, and Cornell says most cats favor uncovered boxes because covers hold odors in. It also has to be big enough inside for the cat to turn round and dig. Two examples, described from the makers’ pages:
| Product | What the maker states | Links |
|---|---|---|
| Good Pet Stuff Original Hidden Litter Box Planter | A planter with faux plants that hides a round litter box inside; a vented carbon filter for odor; “a large and private enclosed space” | See on Amazon · Maker’s page |
| Tuft + Paw Cubby | Not furniture, but an open box with removable 8” walls and semi-transparent sides, for owners who want a tidy look without a cover | See on Amazon · Maker’s page |
We checked these pages on 26 October 2026 and have not tried either product. If your cat starts going elsewhere after you add an enclosure, go back to an open box: that is the change Cornell’s advice points to. There are no prices here: the Amazon links search for the exact product, and we may earn a commission if you buy through them.
Cleaning
- Every day: scoop. Cornell says to remove feces and clumps daily and top up with clean litter.
- Regularly: wash the box with a gentle detergent. The ASPCA suggests rinsing it out once a week with baking soda or unscented soap, and warns that cats can develop an aversion to scented cleaners.
- Full change: often enough that the litter looks and smells dry and clean - more often with several cats.
There is a health reason for the daily scoop, too. The CDC advises changing the litter box daily because the Toxoplasma parasite does not become infectious until one to five days after a cat sheds it. If you are pregnant or have a weakened immune system, ask your doctor about litter duty.
More on routine and equipment in our litter box hygiene guide.
Changing Litter
Cats can be attached to the litter they know; the ASPCA notes that a cat may prefer the type it used as a kitten. Two approaches from the sources above:
- Mix. Cornell advises switching gradually by mixing the new litter in with the old.
- Offer a choice. The ASPCA suggests putting boxes side by side for a while, each with a different litter, and seeing which the cat uses.
If the cat hesitates or goes elsewhere, go back a step.
When It Is Not the Litter
A cat that stops using the box may be ill. Cornell lists inflammation of the urinary tract, kidney disease, thyroid disease, diabetes and digestive problems among the medical causes of house soiling. See the vet first; then work through the box, the litter and the household with our litter box troubleshooting guides.
Frequently Asked Questions
What litter do most cats prefer?
According to the ASPCA, clumping, unscented litter of medium to fine texture, one to two inches deep.
What litter should a kitten have?
The ASPCA’s foster guide specifies non-clumping litter for young kittens learning to use a box. Ask your vet when to change.
Is crystal litter safe?
It is sold for use in the box and is widely used. If your cat eats litter of any kind, tell your vet.
Can I flush plant-based litter?
One maker says its corn litter is tested flushable, one or two clumps at a time. California discourages flushing cat feces, and plumbing and local rules differ - the trash is always acceptable.
How often should I change all the litter?
Often enough that it looks and smells dry and clean, on top of daily scooping. With more cats, more often.
My cat suddenly stopped using the box. Is it the litter?
It can be, especially after a change of brand or scent. But a medical cause comes first on the list, so start with the vet.
Are scented litters a problem?
Both Cornell and the ASPCA describe unscented litter as what cats prefer. The scent is for people.
Does color-changing litter replace a urine test?
No. It can prompt you to call the vet sooner; the diagnosis comes from the vet’s tests.
Final Word
For most homes, an unscented clumping litter in a shallow layer is the place to start, because it is what most cats accept. Go to crystals or a plant-based litter for less weight or less dust, to pellets if your vet or your cat prefers them. Then put the effort where the veterinary sources put it: enough boxes, in quiet places, scooped every day.
Related Reading
- Cat Brushes for Shedding: Slickers, Combs and the FURminator Last updated: October 2026.
