The most common reason cats stop using the litter box is a medical problem
Before you assume your cat is being stubborn, take them to a veterinarian. Urinary tract infections, kidney disease, diabetes, and digestive issues all cause cats to avoid the box or go outside it. A vet can rule these out with a physical exam and urine or stool sample—usually within one visit.
Pain is another medical cause. Arthritis makes it hard for older cats to climb into a box with high sides. Anal gland problems or intestinal parasites make the box itself feel like the source of discomfort, so the cat goes elsewhere to avoid that pain.
If your cat has been using the box normally and suddenly stops, a vet visit should be your first step, not your last resort. Medical problems are the reason in roughly half of all cases where a cat stops using the box.
Key Takeaways
- Medical issues—urinary tract infections, kidney disease, arthritis, and digestive problems—cause most sudden changes in litter box behavior and require a veterinary exam.
- A dirty box, wrong litter type, or box in a noisy or high-traffic location will make a cat stop using it, even if the cat used it before.
- Stress from a new pet, moving, or changes in the home can cause a cat to avoid the box or go in a different spot.
- Cats need one box per cat plus one extra, placed in quiet, accessible areas away from food and water bowls.
- Once medical causes are ruled out, changing the litter, cleaning schedule, box location, or box type often solves the problem within a few days.
The litter box itself is dirty, the wrong type, or in the wrong place
Cats are particular about their bathroom. A box that has not been scooped in a day or two will be rejected by many cats. The rule of thumb is to scoop once daily and do a full litter change weekly, depending on how many cats you have and the type of litter you use.
The litter itself matters. Some cats dislike clay litter and prefer paper, pine, or crystal litter. If you recently switched brands or types, switch back and see if the behavior stops. Scented litter bothers many cats—unscented is usually the safer choice.
Location is equally important. A box in a noisy laundry room, near a furnace, or in a high-traffic hallway stresses a cat. Cats want privacy and a quiet escape route. Move the box to a low-traffic corner, a spare bathroom, or a bedroom. Keep it away from the cat's food and water bowls—cats naturally avoid toileting near where they eat.
Box size and type also matter. The box should be at least 1.5 times the length of your cat's body. Covered boxes feel safe to some cats but trap odor and make others feel trapped. Try an uncovered box or a larger storage container with a hole cut in the side if your cat is avoiding a covered box.
You do not have enough boxes or they are not in the right spots
The standard rule is one box per cat, plus one extra. A household with two cats needs three boxes. If you have only one box and multiple cats, one cat may avoid it because another cat is guarding it or because it is too dirty from heavy use.
Spread boxes across different areas of your home. If you have a two-story house, put at least one box on each floor. If your cat spends time in a specific room, put a box there. A cat that has to travel far to reach the box may not make it in time, especially if it is older or has a medical issue.
Make sure each box is straightforward to reach. A box in a basement corner behind boxes of storage is not accessible. A box blocked by a door that closes is not accessible. Your cat should be able to get to the box without navigating obstacles or passing through areas where it feels unsafe.
Stress from changes in the home is making your cat avoid the box
Cats are sensitive to change. A new pet, a new person moving in, renovations, moving to a new house, or even rearranging furniture can trigger litter box avoidance. The cat may go in a different room, under a bed, or in a closet because that spot feels safer or more familiar.
During stressful periods, add extra boxes in the areas where your cat is going instead of the litter box. This gives the cat a legitimate option while you work on reducing the stress. Keep the cat's routine as stable as possible—same feeding times, same play schedule, same quiet spaces.
If you have introduced a new cat or pet, keep them separated for the first week or two. Each cat needs its own box, food, and water in a space where it does not have to encounter the other animal. Gradual introductions over days or weeks reduce the stress that causes box avoidance.
Your cat is marking territory or has developed a preference for another spot
If your cat is spraying urine on walls or furniture rather than going in the box, this is often territorial marking, especially in unneutered or unspayed cats. Spaying or neutering stops this behavior in most cases. If your cat is already fixed and is spraying, this usually signals stress or a medical issue—both worth discussing with a vet.
Sometimes a cat will choose a different spot—a corner of the bedroom, a bathtub, a pile of laundry—and return to that spot repeatedly. This often happens after an accident (the cat had diarrhea or missed the box once) and now associates that spot with the bathroom. Clean the spot thoroughly with an enzymatic cleaner to remove all scent, then place a litter box directly on or very near that spot. Once the cat uses the box there for a week, gradually move the box back to your preferred location, a few inches at a time.
Litter box training or retraining may be necessary
Kittens sometimes need to be shown where the box is. Place a new kitten in the box as soon as it arrives, and again after meals and naps. Praise and reward with a treat when the kitten uses the box. Most kittens catch on within days.
Adult cats that have stopped using the box can often be retrained by confining them to a smaller space—a bathroom or bedroom—with the litter box, food, water, and a bed. Keep the cat in this space for a few days while you address any medical issues and clean the box twice daily. Once the cat is using the box consistently, gradually expand the space it has access to.
If your cat is going outside the box but near it, the box itself may be the problem—too small, too dirty, or the wrong type. If the cat is going in a completely different room, the issue is usually location, stress, or a medical problem rather than a training issue.
Frequently Asked Questions
My cat uses the box sometimes but not always. What does that mean?
Inconsistent use usually points to a medical issue, especially if it is a sudden change. Urinary tract infections and digestive problems often cause this pattern. A vet visit is the first step. If medical causes are ruled out, the box may be too dirty, too small, or in a location that stresses your cat sometimes but not always.
Can I punish my cat for not using the litter box?
No. Punishment makes the problem worse by increasing stress and teaching the cat to hide when it goes to the bathroom. Your cat is not being defiant—it is either sick, uncomfortable, or afraid. Focus on finding the cause and fixing it rather than correcting the behavior.
How long does it take to fix a litter box problem?
If the cause is a dirty box or wrong location, the cat often returns to normal use within a few days of the change. Medical issues take longer—treatment may take weeks, and the cat may need time to trust the box again. Stress-related avoidance can take two to four weeks to resolve once the stressor is removed.
Should I use a litter box liner?
Liners are optional and many cats dislike them because they bunch up and feel strange under their paws. If your cat is already avoiding the box, remove the liner. If your cat is using the box fine, liners make cleanup easier but are not necessary.
What if my cat goes in the bathtub instead of the litter box?
A bathtub is smooth and straightforward to clean, so some cats prefer it. Place a litter box in the bathroom near the tub. If the cat continues using the tub, put a small amount of litter in the tub itself, then gradually transition it to the box over a week or two. You can also place a mat or object in the tub to make it less appealing.