The most common reason: the box itself is the problem

Cats stop using their litter box for poop far more often because of the box than because of illness. The box may be too small, too dirty, in the wrong location, or filled with litter your cat dislikes. Start by checking the basics: the box should be at least 1.5 times the length of your cat's body, cleaned of poop daily, and placed away from their food and water bowls.

Many cats reject boxes that are covered or have a top-entry design, even though owners buy them to contain odor. An open box gives your cat an escape route if another pet approaches, which matters more to them than privacy. If you have multiple cats, the rule is one box per cat plus one extra—a cat may use one box for urine and another for poop, or avoid a box if another cat is guarding it.

The litter itself is another common culprit. Cats have preferences for texture and scent that vary widely. If you recently switched brands, your cat may refuse it. Try offering a second box with the old litter type while keeping the new one, so your cat can choose. Some cats prefer fine-grained litter, others want larger pellets or paper-based litter. Scented litters bother many cats more than they bother owners.

Key Takeaways

  • A litter box that is too small, too dirty, or in the wrong location causes most cases of cats pooping outside the box.
  • Covered boxes and top-entry boxes discourage use even though they reduce odor, because cats feel trapped.
  • If you have multiple cats, provide one box per cat plus one extra, placed in separate areas.
  • Medical problems like digestive issues, parasites, or pain during defecation require a veterinary exam and should be ruled out first.
  • Stress from changes in the home, new pets, or loud noises can cause temporary litter box avoidance.

Medical reasons your cat may avoid the box

If the litter box itself looks fine and your cat is still pooping outside it, a veterinary exam is the next step. Digestive problems, parasites, and inflammatory bowel disease all cause cats to associate the box with discomfort and avoid it. Diarrhea or loose stool may make your cat feel they cannot reach the box in time. Pain during defecation—from conditions like anal gland impaction or hemorrhoids—teaches a cat to go elsewhere.

Older cats sometimes develop arthritis that makes climbing into a high-sided box painful, or they may lose bladder and bowel control as kidney function declines. A cat with hyperthyroidism or diabetes may need to go more often and cannot always make it to the box. Your veterinarian can run bloodwork and a fecal exam to rule out these problems. Do not assume behavior is a choice until medical causes are off the table.

Stress and changes in the home

Cats are sensitive to disruption. A new pet, a move to a new room, construction noise, or even rearranging furniture can trigger litter box avoidance. Some cats regress temporarily when a family member leaves or arrives. If the timing lines up with a change in your home, the behavior is often temporary—but you can speed recovery by keeping the litter box in a quiet, consistent location and maintaining a strict cleaning routine.

If you have recently added a new cat or dog, the original cat may feel threatened at the litter box and choose to go elsewhere rather than risk confrontation. Separate boxes in different rooms, or even different floors of the house, can help. Some cats need a few weeks to adjust to a new pet before they feel safe using the box again.

Territorial marking versus true defecation

It is worth distinguishing between a cat pooping outside the box and a cat spraying urine to mark territory. Spraying is usually on vertical surfaces like walls or furniture, and the cat stands with its tail up. True defecation outside the box leaves feces on the floor, in corners, or in other spots. The causes and solutions differ, so identifying which behavior you are seeing matters.

If your cat is leaving feces in specific spots repeatedly—always the same corner, or always near a door—they may be marking that area as theirs. This is more common in multi-cat homes or when a cat feels insecure. Cleaning the spot thoroughly with an enzymatic cleaner removes the scent and discourages repeat use. Increasing the number of litter boxes and placing one near the marked spot can also help.

How to retrain a cat to use the box

Once you have ruled out medical problems and fixed the box setup, retraining takes patience. Place your cat in the litter box after meals, after naps, and whenever you see signs they need to go—sniffing, circling, or crouching. Praise and offer a small treat when ready after they use the box. Do not punish accidents; punishment creates fear and makes the problem worse.

If your cat has been pooping in a specific spot, place a litter box directly in that spot for a week or two. Once they use it consistently there, gradually move the box a few feet per day toward the location you prefer. This works because cats often return to spots where they have eliminated before, so meeting them halfway helps break the habit.

Confine your cat to a smaller space—a bedroom or bathroom with food, water, and the litter box—for a few days if accidents are frequent. This limits their options and increases the chance they will use the box. Once they go a few days without accidents, gradually expand their access to the rest of the house.

When to call your veterinarian

Contact your vet if the problem started suddenly, if your cat is straining or seems to be in pain, or if the stool looks abnormal—very loose, bloody, or containing mucus. These signs point to a medical issue that needs treatment. Also call if your cat is older, has lost weight, or is drinking and urinating more than usual, as these can indicate thyroid problems or kidney disease.

If you have made changes to the litter box setup and cleaned thoroughly, but the behavior continues for more than two weeks, a vet visit will help rule out underlying illness and may include a recommendation to see a veterinary behaviorist.

Frequently Asked Questions

Could my cat be pooping outside the box because they are angry at me?

Cats do not poop outside the box as punishment or to show anger. They are responding to something physical—the box itself, a medical problem, stress, or a change in their environment. Assuming anger leads owners to punish the cat, which makes the problem worse. Focus on the box, the cat's health, and what changed recently.

Is it normal for a cat to use one box for pee and another for poop?

Yes, this is common. Some cats prefer to separate their bathroom habits. If you have one box and your cat is pooping elsewhere while using the box for urine, add a second box in a different location. This often solves the problem when ready.

My cat poops outside the box but pees in it. What does that mean?

This usually means your cat finds the box acceptable for urine but not for defecation. The issue is often the litter type, box size, or location. Try a second box with different litter, or move the existing box to a quieter spot. If the problem persists after two weeks, have your vet check for digestive issues or pain during bowel movements.

Can I use a larger storage container as a litter box?

Yes. Many owners use plastic storage bins with one side cut down low for entry. This gives cats more space and often solves avoidance problems. Make sure the entry is low enough that your cat can step in easily, and that the bin is large enough for them to turn around and dig.

How long does it take to retrain a cat to use the litter box?

Most cats return to consistent box use within one to three weeks once the underlying cause is fixed and the box setup is corrected. Some take longer if stress or medical issues are involved. Consistency in cleaning and placement matters more than time—a cat will use a box that feels safe and clean.