The most common reasons cats avoid the litter box for bowel movements
Cats poop outside the box for one of five reasons: the box itself is the problem, the litter is wrong, the cat has a medical issue, the cat is stressed, or the cat is marking territory. Most of the time it is the box or the litter. Start there before assuming behaviour or health trouble.
A box that is too small, too dirty, or in a bad location will make a cat go elsewhere. Cats are particular about where they eliminate — they want privacy, distance from food and water, and a clean surface. If the box has not been scooped in a day or two, or if it is in a high-traffic hallway, a cat may decide the bathroom is unacceptable and find an alternative spot.
Medical problems — intestinal parasites, inflammatory bowel disease, food allergies, or digestive upset — cause urgency and pain. A cat with diarrhoea or loose stool may not make it to the box in time, or may associate the box with discomfort and avoid it. If the poop is loose, frequent, or bloody, a vet visit is the first step, not a litter box fix.
Key Takeaways
- Scoop the litter box at least once daily and replace litter completely every 7 to 10 days, because cats will avoid a dirty box.
- Place the box in a quiet, low-traffic area away from food and water bowls, and use a box that is 1.5 times the length of your cat's body.
- If your cat has loose stool, strains, or goes more than twice a day, see a vet before changing the litter box setup.
- Add a second box in a different location if you have multiple cats or if the first box is far from where your cat spends most of its time.
- Switch litter gradually over 7 to 10 days if you change brands, because cats often reject unfamiliar litter texture or scent.
Check the litter box size and location first
The box must be large enough. A common mistake is using a box that looks big to humans but feels cramped to the cat. The rule is straightforward: the box should be at least 1.5 times the length of your cat's body from nose to tail. If your cat is 18 inches long, the box should be at least 27 inches. Most standard boxes sold in stores are too small for adult cats.
Location matters as much as size. The box should be in a quiet, low-traffic area — not in a hallway where people walk past constantly, not next to a washing machine or furnace that makes noise, and not near the cat's food and water bowls. Cats do not want to eliminate where they eat. If the box is in a basement corner and the cat spends all day upstairs, the cat may not bother to go downstairs in time.
If you have a multi-level home, put a box on each level. If the cat is older or has mobility issues, place the box on the same floor where the cat spends most of its time. Moving the box to a better location often solves the problem within a few days.
Clean the box more often and change the litter type carefully
Scoop the box at least once daily, ideally twice. Many cats will not use a box with visible waste in it. If you are scooping once a week or less, that is the problem. Replace all the litter completely every 7 to 10 days, not just top it off.
If you recently switched litter brands or types, that may be why the cat is going elsewhere. Cats are sensitive to texture and scent. A cat used to clay litter may reject crystal litter, or vice versa. If you must change brands, do it gradually over 7 to 10 days — mix the old litter with the new, increasing the ratio of new litter each day. This gives the cat time to adjust.
Scented litter is for humans, not cats. Many cats dislike strong perfume and will avoid the box because of it. Unscented litter is almost always the better choice. If the current litter has a strong smell, switch to an unscented brand and see if the behaviour stops.
Rule out medical problems with a vet visit
If the poop is loose, pasty, or watery, or if the cat is straining or going more than twice a day, the issue is likely medical, not behavioural. Intestinal parasites, food allergies, inflammatory bowel disease, and other digestive problems all cause cats to avoid or miss the box. A vet can run a stool test and examine the cat to rule these out.
Even if the poop looks normal, a vet visit is worth it if the behaviour is new and the box and litter are fine. Cats sometimes develop sensitivities to their food that cause urgency or discomfort. A vet can recommend a different diet or rule out parasites and infection.
Do not assume the cat is being stubborn or spiteful. Cats do not poop outside the box to punish you. If the behaviour is sudden, something has changed — either the cat's health or the cat's environment.
Add a second box if you have multiple cats or a large home
The rule is one box per cat, plus one extra. If you have two cats and one box, one cat may be blocked from using it by the other, or may not want to share. Add a second box in a different location — ideally in a different room or on a different floor.
Even with one cat, a second box in a different area can help. If the cat spends time in multiple rooms and the box is only in one, the cat may not always make it in time. A second box reduces the distance the cat has to travel.
Place the boxes far apart, not side by side. Cats see two boxes next to each other as one large box, not as two separate options. Spread them across your home so the cat always has a nearby option.
Manage stress and environmental changes
Stress can trigger litter box avoidance. A new pet, a move, a change in the household, or even rearranging furniture can upset a cat enough to stop using the box normally. If the behaviour started after a change, give the cat time to adjust — usually a few weeks. Keep the box in the same spot and maintain a routine.
If stress is ongoing — for example, a new dog in the house — you may need to give the cat a separate space with its own box, food, and water. A closed bedroom or bathroom where the cat can retreat helps reduce anxiety.
Some cats also respond well to pheromone sprays like Feliway, which mimic natural calming scents. These are available at pet stores and may help a stressed cat feel more find using the box.
What to do if the cat has already chosen a spot outside the box
If the cat has been pooping in the same corner or room repeatedly, clean that spot thoroughly with an enzymatic cleaner designed for pet waste. Regular cleaners do not break down the scent markers that tell the cat "this is a bathroom." Enzymatic cleaners do. If the cat can still smell its own waste, it will keep going there.
After cleaning, block access to that spot if possible, or place a litter box right there temporarily. Once the cat is using the box consistently, you can gradually move it back to a better location — move it a few feet every few days. The cat will usually follow.
Do not punish the cat or rub its nose in the waste. This creates fear and stress, which makes the problem worse. straightforward clean the spot, improve the box setup, and give the cat a reason to use the box instead.
Frequently Asked Questions
How long does it take for a cat to stop pooping outside the box after I fix the problem?
Most cats return to normal within a few days to a week once the underlying issue is fixed. If you cleaned the box, changed the litter, or moved it to a better location, watch for improvement within 3 to 5 days. If the problem was medical, improvement depends on treatment — a vet can tell you what to expect.
Can I use a covered litter box to stop my cat from pooping outside?
Covered boxes can actually make the problem worse. They trap odour and make the cat feel trapped, especially if the cat is large or anxious. Open boxes are almost always better. If you use a covered box now, try removing the cover and see if the behaviour improves.
What if my cat poops outside the box but pees inside it?
This usually means the box is acceptable for one behaviour but not the other. The cat may find the box too dirty for poop but acceptable for pee, or may have a medical issue affecting bowel control but not bladder control. Scoop more often and see a vet to rule out digestive problems.
Is my cat doing this on purpose to upset me?
No. Cats do not have the reasoning ability to punish humans. Poop outside the box is always caused by a problem with the box itself, the litter, the cat's health, stress, or the cat's location. Find and fix the cause, and the behaviour will stop.
Should I use litter box attractants or sprays to get my cat back in the box?
Attractants rarely work and can backfire. The cat is avoiding the box for a reason — usually because it is dirty, the wrong size, in a bad spot, or the cat is sick. Fix those problems first. Once the box is acceptable, the cat will use it without needing a spray.