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Why your cat pees outside the litter box
Cats do not do this out of spite. It is nearly always one of six things, and they are worth checking in this order.
Peeing or spraying? They are different problems
| Inappropriate urination | Spraying | |
|---|---|---|
| Posture | Squatting | Standing, tail upright and quivering |
| Where | Horizontal — floor, rug, bed | Vertical — walls, door frames, furniture sides |
| Amount | A full bladder | A small amount |
| What it means | Something is wrong with the box, or the cat | Communication — usually stress or territory |
The six causes, in order
- Medical. Always first. Urinary tract infection, crystals, cystitis, kidney disease and arthritis (which makes climbing into a high-sided box hurt) all present exactly like a behaviour problem. Get this ruled out before you change anything else.
- The box is not clean enough. Cats have a much lower tolerance than people. Scoop twice a day, full change weekly.
- Wrong box. Too small (it should be about 1.5× the cat's body length), sides too high for an older cat, or a hood. Many cats dislike hoods — they trap smell and remove escape routes.
- Wrong litter. Most cats prefer fine, unscented, clumping litter about 3–4 cm deep. Scented litter is made for humans and cats often refuse it.
- Wrong place. Next to the washing machine, in a cupboard, beside the food bowls, or anywhere the cat can be cornered. Cats will not toilet where they feel trapped or where they eat.
- Stress. A new person, a new pet, building work, a cat outside the window. This is usually what is behind spraying.
A setup that fits a small flat
- Open tray, no hood, on a wipeable mat. Put it against a wall in a quiet spot with a clear line of sight out.
- Not in the bathroom if the door might get closed. The single most common accidental cause.
- Away from food and water — at least a couple of metres.
- A sealed bin next to it and a scoop. If scooping is inconvenient it will not happen twice a day.
Killing the smell
- Enzyme cleaner on every accident site. Not bleach, not ammonia — ammonia smells like urine and re-marks the spot. Enzyme cleaners break the compounds down rather than masking them.
- Unscented clumping litter, deep enough (3–4 cm) that urine clumps instead of pooling.
- Scoop twice a day. Nothing else replaces this.
- Ventilate. A slightly open window near the tray beats any deodoriser.
- Baking soda under the litter, lightly, if you still need more.
After a house move
Moves break the smell map a cat navigates by, and a lot of cats stop using the box for a week or two afterwards.
- Set the box up in the first room the cat lives in, before anything else.
- Bring the old litter across — a scoop of used litter carries the message "this is yours".
- Keep the cat in one room for the first few days rather than giving it the whole flat.
- Put the box where the cat can see it from where it hides. In an unfamiliar place, a box behind a door might as well not exist.
What not to do
Do not rub a cat's nose in it, shout, or shut it in with the box. Punishment raises stress, and stress is one of the six causes — so it makes the problem worse rather than better.
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