Quick answer: Switch cat litter gradually over about six days: start with roughly one-third new litter mixed into the old, then increase the new litter each day. Keep the box clean and in the same spot, and call your vet if your cat stops using the box.
Maybe your current litter is dusty, your cat is tracking it through the house, or the brand you love has disappeared from the shelf. Whatever the reason, changing litter is easy for you and surprisingly big for your cat. Cats rely on smell and texture, and an abrupt swap can turn a reliable litter box user into a cat that goes elsewhere. The fix is a slow, predictable transition. This guide gives you a six-day plan, a table of common problems and the signs that mean it is time to involve your veterinarian.
Why should you switch cat litter gradually?
Cats are creatures of routine, and the litter box is a place where they want certainty. The American Association of Feline Practitioners (AAFP) and the International Society of Feline Medicine (ISFM) recommend transitioning litter over about six days, as summarized in Purina's guide to how to switch cat litter. If the change is too quick, or your cat simply dislikes the new product, they may start avoiding the box and eliminate somewhere else.
Before you change anything, ask whether you need to. If your cat is using the current litter happily and it does not bother you, there is no reason to switch. The change is most useful when the litter causes dust, tracking or odor problems, when you need a different texture for a kitten, or when a product is no longer available.
What does a 6-day litter transition look like?
The exact ratios are flexible. What matters is that the new litter increases a little each day and your cat never faces a sudden change. Here is a simple schedule you can adapt:
| Day | Old litter | New litter | What to watch |
|---|---|---|---|
| 1 | About two-thirds | About one-third | Your cat may sniff more than usual. That is normal. |
| 2 | About two-thirds | About one-third | Hold steady if your cat seems unsure. |
| 3 | Half | Half | Check that urine and stool are still going in the box. |
| 4 | Half | Half | Scoop at least once a day. |
| 5 | About one-third | About two-thirds | Look for any sign of hesitation at the box. |
| 6 | None | All new litter | Do a full wash and refill when the old litter is gone. |
If your cat hesitates at any stage, go back to the previous ratio for a day or two. A slower switch is always better than a rushed one.
What should you keep the same during the switch?
Change one thing at a time. During the litter transition, keep these constants:
- Box location. The ASPCA advises placing the box in a quiet, accessible spot and, if it must move, shifting it only a few inches per day.
- The box itself. Do not swap the litter and the box in the same week. If you are changing boxes, keep the old litter at first.
- Depth and cleaning routine. Keep the same fill level and keep scooping solid waste daily.
- Household calm. Avoid switching litter during a move, holiday guests or a new-pet introduction if you can help it.
Our guides on how often to clean a litter box and clumping vs non-clumping litter cover the maintenance side so the new product gets a fair test.
How do you choose a new litter your cat will accept?
If you have no strong preference, many vets and cat organizations suggest starting with an unscented, clumping litter, because many cats find it comfortable. Zoetis notes that adult cats often prefer a fine-grained clumping litter and that kittens may do better with pellet litter. Strong perfumes can bother a cat's sensitive nose, and the ASPCA specifically advises against scented products and ammonia-based cleaners around the box.
Texture matters too. Cats walk and dig with bare paws, so a rough, large pellet can feel very different from fine sand. If your cat has had a recent paw injury or is a senior with sore joints, softer textures and low-sided boxes can make using the box easier.
Finally, remember that trial and error is normal. If your cat rejects a litter after a gradual transition, that is useful information, not a failure. Return to the previous litter and try a different texture or brand later.
What if my cat stops using the box after the change?
First, slow down and go back to the litter your cat accepted. Then run through this checklist:
| Sign | Possible cause | What to try |
|---|---|---|
| Digging a lot but not using the box | Texture or scent is unfamiliar | Return to the old ratio and reduce the new litter |
| Urinating just outside the box | Box too dirty, or litter dislike | Scoop more often; offer an extra box with the old litter |
| Sitting at the edge, then leaving | Dust or scent bothering the nose | Switch to an unscented, low-dust product |
| Straining or frequent trips with little output | Possible medical problem | Contact your vet promptly |
| Sudden refusal with other changes (appetite, energy) | Illness or stress | See your vet before blaming the litter |
The ASPCA's litter box problems page is clear that refusing the box can be linked to a medical condition that needs treatment. If your cat has accidents with no clear reason, or you see straining, blood or crying in the box, treat it as a vet question, not a litter question. Our guide on why a cat pees outside the litter box goes deeper.
What about kittens that eat litter?
Curious kittens sometimes taste litter. According to Purina's summary, changing litter is unlikely to make a cat sick, but eating litter can cause digestive upset, and clumping litter in particular can contribute to intestinal blockage. If your cat or kitten tends to snack on litter, talk to your vet and consider a non-clumping option. Persistent litter eating can also be linked to health issues, so mention it at the next check-up.
For multi-cat homes, the usual guidance is one box per cat plus one extra, placed in separate, quiet spots. During a litter change, offering a second box with the old litter lets each cat choose, which makes the switch safer for everyone.
How can you reduce stress during the change?
Cats read small changes as big ones, so keep everything else steady while the litter changes. Feed at the usual times, keep play routines, and give your cat a calm place to retreat. A soft hideaway such as our enclosed plush cat bed gives a nervous cat somewhere secure to rest while the household adjusts.
Praise or reward your cat quietly after they use the box, and never scold for accidents. Clean accidents with an enzymatic cleaner made for pet messes and avoid ammonia-based products, which can smell like urine to cats. If you want to see what else is in the store, the CozeCats catalog is a quick browse.
Give a nervous cat a calm place to settle
While litter routines change, a soft enclosed bed gives your cat a secure spot to rest.
A final tip: keep a note of the date you began the switch and how your cat is doing. If problems appear, that log helps your vet work out whether it is the litter, the box or something medical.
Frequently asked questions
How long does it take to switch cat litter?
About six days is the commonly recommended transition, increasing the new litter each day. Some cats need longer, so slow down if your cat hesitates.
Can I switch cat litter cold turkey?
It is not recommended. A sudden change in smell and texture can make cats avoid the box. A gradual mix is much safer.
What is the best cat litter to switch to?
There is no single best litter. If you have no preference, unscented clumping litter is a common starting point, but your cat's own preference matters most.
Why is my cat peeing outside the box after I changed litter?
The new litter may be unfamiliar, or the box may need cleaning. Go back to the previous litter, scoop daily and see your vet if accidents continue, because medical problems can look like litter dislike.
Should I change the litter box and litter at the same time?
No. Change one thing at a time. Keep the old litter in a new box, or the old box with new litter, so your cat has one familiar element.
Keep reading
- How Often Should You Clean a Litter Box?
- Clumping vs Non-Clumping Cat Litter
- Why Is My Cat Peeing Outside the Litter Box?
- Cat Constipation: Signs and Causes
- Signs of Stress in Cats
