The most common reason is a change in the box itself or where it sits

Cats are creatures of habit. When a cat suddenly stops using the litter box, the first place to look is the box and its location—not the cat's behavior or health. A new brand of litter, a box moved to a different room, a box placed too close to food and water, or even a box that hasn't been scooped in a day or two can all trigger the problem.

The box itself matters more than most people realize. Some cats dislike covered boxes. Others reject litter that smells strongly of perfume or has a texture they didn't grow up with. If you've changed anything about the setup recently—the litter brand, the box location, the room it's in, or how often you clean it—that change is often the culprit.

Key Takeaways

  • A change in litter brand, box location, or cleaning schedule is the most common reason a cat stops using the box.
  • Medical problems like urinary tract infections, kidney disease, and diabetes cause inappropriate elimination and require a veterinary exam.
  • Stress from a new pet, a move, or a change in the household can make a cat avoid the box even if nothing physical changed.
  • You need at least one litter box per cat, plus one extra, placed in quiet, accessible locations away from food and water.
  • A veterinarian should rule out illness before you assume the problem is behavioral or environmental.

Medical problems that cause litter box avoidance

Before you change anything about the box or the environment, take your cat to a veterinarian. Cats often stop using the litter box because of pain or illness, not because they are being difficult. Urinary tract infections, kidney disease, diabetes, and hyperthyroidism all cause cats to urinate or defecate outside the box. A cat with a urinary tract infection may associate the box with pain and avoid it, even though the box itself is fine.

Older cats are especially prone to kidney disease and arthritis, both of which can make using the litter box uncomfortable or difficult. A cat with arthritis may struggle to climb into a box with high sides. A cat with kidney disease may need to urinate more often and may not make it to the box in time. Your veterinarian can run blood work and a urinalysis to rule out these conditions. This step should come before any other changes.

Stress and changes in the household

Cats are sensitive to disruption. A new pet, a new person in the home, a move to a new house, or even rearranging furniture can stress a cat enough to stop using the litter box. Some cats also stop using the box if they feel threatened by another cat or pet near it. If a dog guards the hallway where the litter box sits, the cat may avoid it rather than risk confrontation.

Stress-related litter box avoidance usually improves once the cat adjusts to the change, but you can speed that up by giving the cat a quiet, safe space away from the source of stress. If another pet is the problem, place the litter box in a room the other pet cannot access, or use a baby gate that the cat can squeeze through but the dog cannot.

The number and placement of litter boxes

A common mistake is having too few boxes. The general rule is one box per cat, plus one extra. A household with two cats should have three boxes. Boxes should be spread across different areas of the home, not clustered in one room. If your cat has to travel far or pass through another cat's territory to reach the box, it may avoid the trip.

Location matters as much as quantity. Never place a litter box next to the cat's food and water bowls—cats naturally avoid eliminating near where they eat. Boxes should be in quiet, low-traffic areas where the cat feels safe. A box in a busy hallway or near a loud appliance may be rejected. If you have a multi-story home, place at least one box on each floor so your cat doesn't have to go far.

Litter type and box cleanliness

Cats have preferences about litter texture and smell, and these preferences can be strong. If you switched from unscented clumping litter to a crystal litter or a heavily perfumed brand, your cat may refuse to use it. The safest approach is to keep the same litter your cat is used to. If you must change brands, mix the old and new litter together for a week or two so the transition is gradual.

Cleanliness is non-negotiable. Scoop the box at least once daily, and completely change the litter and wash the box weekly. A dirty box is one of the fastest ways to drive a cat away. If you have multiple cats, you may need to scoop more than once a day. Some cats are pickier about cleanliness than others, but all cats prefer a clean box to a dirty one.

Box size and type

The box should be large enough for your cat to turn around and dig comfortably. A box that is too small or too shallow will be rejected. As a rule, the box should be at least one and a half times the length of your cat's body. Covered boxes appeal to some cats but stress others—if your cat has stopped using a covered box, try removing the cover or switching to an open box.

High-sided boxes can be difficult for older cats or cats with arthritis. If your cat is senior or has mobility issues, a lower-sided box or a storage container with one side cut down may work better. Some cats also prefer a larger, shallower box to a standard litter box. Observe your cat's behavior—if it seems to struggle getting in or out, the box may be the problem.

When to call a veterinarian

If your cat has never had a litter box problem before and suddenly stops using the box, a veterinary visit should be your first step. Do not assume the problem is behavioral until illness has been ruled out. Bring a urine sample if possible—your veterinarian can test it on the spot. Be prepared to describe when the problem started, whether the cat is straining, and whether you've noticed any other changes in appetite, water intake, or energy level.

If your veterinarian finds no medical cause, then work through the environmental and behavioral changes. Keep a record of when the cat uses the box and when it doesn't—patterns often reveal what triggered the problem. If the issue persists after you've addressed the obvious causes, your veterinarian can refer you to a feline behavior specialist.

Frequently Asked Questions

Can stress alone cause a cat to stop using the litter box?

Yes. Cats under stress may avoid the box even if it's clean and in the same location. Common stressors include a new pet, a move, or a change in the household routine. Once the cat adjusts or the stressor is removed, the behavior usually improves. In the meantime, provide a quiet, safe space and extra boxes in different areas.

What if my cat is using the box but also going outside it?

This often means the box is too small, too dirty, or the cat is not getting to it in time due to illness or stress. Increase the number of boxes, make sure they're very clean, and have your veterinarian rule out urinary tract infections or kidney disease, which cause frequent urination.

Is it normal for a cat to stop using the box after moving to a new house?

Yes, moving is stressful for cats. Set up the litter box in a quiet room before the cat explores the rest of the house. Let the cat adjust to one room at a time. Once it's comfortable, it will usually return to using the box. This can take days to weeks depending on the cat.

Should I punish my cat for not using the litter box?

No. Punishment will only increase stress and make the problem worse. The cat is not being spiteful—it's responding to pain, illness, stress, or a problem with the box itself. Focus on finding and fixing the cause rather than disciplining the cat.

How long does it take for a cat to adjust to a new litter brand?

Most cats need one to two weeks to adjust to a new litter. Mix the old and new together gradually so the transition is less jarring. If your cat rejects the new litter after two weeks, it may straightforward prefer the old brand—switching back is often the easiest solution.