Why is my cat peeing outside the litter box?
Updated By PetymFacts checked against official sources on
Quick answer
A cat that pees outside its litter box usually has a urinary problem such as cystitis, is stressed, or dislikes something about the tray: its cleanliness, litter, size or place. See your vet first to rule out illness. If your cat strains, cries or passes only drops of urine, go to a vet now: a blocked bladder can kill.
Once the vet has checked your cat, fix the tray set-up, clean soiled spots with an enzymatic cleaner and reduce stress. Never punish: it makes cats fearful and the problem worse.
When is a cat peeing outside the box an emergency?
Check these first. A urinary blockage is an absolute emergency.
If Straining in the tray, going often but passing little or no urine, or crying while trying.
Go to a vet now. Cornell calls a urethral blockage an absolute emergency, and it is more common in male cats. Cornell Feline Health Center
If Your cat seems to be straining to poo but nothing comes.
Merck notes owners can confuse a urinary blockage with constipation. Treat it as urgent and see a vet. Merck Veterinary Manual
If Blood in the urine, or peeing in small amounts in many places.
See your vet soon, the same day if you can. These are signs of lower urinary tract disease. International Cat Care
If Drinking and peeing much more than usual, or weight loss.
Book a vet visit soon. Kidney disease, diabetes and hyperthyroidism can all cause soiling. International Cat Care
What are the common causes?
VCA and International Cat Care group them like this. More than one can apply.
| Examples | Clues | |
|---|---|---|
| Urinary disease VCA Animal Hospitals | Cystitis, including stress-related idiopathic cystitis; crystals, stones, infection | Small, frequent wees; straining; blood in the urine |
| Other illness VCA Animal Hospitals | Kidney disease, diabetes, hyperthyroidism, age-related decline | More thirst and urine, weight change |
| Pain or stiffness International Cat Care | Arthritis, injury | High-sided trays or stairs become hard to manage |
| Tray aversion VCA Animal Hospitals | Dirty tray, scented litter, covered or small tray, noisy spot | Wees just beside the tray |
| Location or surface preference VCA Animal Hospitals | Prefers a rug, bed, bath mat or tiles | Same spot or same surface each time |
| Stress International Cat Care | Other cats, a dog, visitors, a move, outdoor cats seen through windows | Started after a change at home |
| Marking (spraying) International Cat Care | Usually unneutered cats, or many cats in one home | Small squirts on upright surfaces |
Is my cat spraying or peeing?
They look different and have different fixes.
International Cat Care describes spraying as a cat backing up to an upright surface, raising its hindquarters and quivering tail, and releasing a small amount of urine, usually under 2 ml. Peeing is a squat with a full puddle, usually on a flat surface such as the floor, a bed or a rug. Both males and females can spray. It is commoner in males and in unneutered cats and usually drops a lot after neutering, though around 10% of neutered males and 5% of neutered females still spray, and the likelihood rises with the number of cats at home.
Spraying is communication, often about stress or other cats. Peeing outside the box is more often about health or the tray. Either way, your vet's check comes first.
How do I stop my cat peeing outside the box?
Work through these in order.
1. See your vet
VCA recommends a full physical examination and a urine test, and sometimes blood tests, X-rays or a urine culture. Take a note of when it started and where your cat is going. VCA Animal Hospitals
2. Think about what changed
A new litter, a moved tray, a new pet, a visitor, building work or a move. VCA advises going back to the old set-up if a change came just before the problem. VCA Animal Hospitals
3. Fix the trays
One tray per cat plus one, in quiet spots away from food, big enough to turn in, with at least 3 cm of fine, unscented litter. Scoop at least daily. International Cat Care
4. Offer choices
VCA suggests preference tests: try different litters, trays and places side by side and see which your cat uses. VCA Animal Hospitals
5. Clean soiled spots properly
An enzymatic cleaner made for cat urine, or a 10% biological washing powder solution, then rinse and dry. Avoid ammonia-based products, which smell like urine. International Cat Care
6. Reduce stress
Block the view of outdoor cats, give each cat its own resources and hiding places, and keep routines steady. International Cat Care
7. Confine if it persists
VCA says most cats need confining to a small room with bedding, water and a tray for 1 to 4 weeks, with a daily log of where they go. VCA Animal Hospitals
What helps, and what makes it worse?
Do
- Keep plenty of fresh water out: Cornell notes that cats that drink less are among those most often affected by urinary problems. Cornell Feline Health Center
- Use soft, unscented litter and a tray at least 1.5 times your cat's length. Battersea Dogs and Cats Home
- Make soiled spots less inviting, or block access for now. VCA Animal Hospitals
- Talk to your vet about neutering if your cat is entire and spraying. International Cat Care
Don’t
- Punish, shout or rub its nose in it. International Cat Care says punishment makes cats fearful and can make the problem worse. International Cat Care
- Clean with bleach or phenol disinfectants that turn cloudy in water: they can deter cats and phenols are toxic to them. International Cat Care
- Use scented litter, liners or strong deodorants. International Cat Care
- Wait and watch a cat that is straining. A blocked cat needs a vet the same hour. Cornell Feline Health Center
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Questions owners ask
Why has my cat suddenly started peeing outside the litter box?
- A sudden change often means a medical problem, such as cystitis, crystals or a urinary infection, or a recent stress such as a new pet, visitors or a move. See your vet first. If your cat is straining or passing little or no urine, go immediately, because a blockage is an emergency.
Why does my cat pee on my bed?
- Beds are soft, absorbent and smell of you, so a cat that dislikes its tray, feels stressed or is unwell may choose one. Have your vet check your cat, clean the bedding with an enzymatic or biological wash, and look at the tray set-up and recent changes.
Can stress make a cat pee outside the box?
- Yes. International Cat Care says other cats, a neighbour's dog, sudden noises and changes at home can make toileting feel unsafe, and feline idiopathic cystitis is stress-related and often causes urination outside the tray. A vet check comes first, then reducing stress.
What is the best way to clean cat pee from tiles and mattresses?
- Use an enzymatic cleaner made for cat urine, or a 10% solution of biological washing powder, rinse with cold water and let it dry fully, as International Cat Care advises. Avoid ammonia-based products, which smell like urine and can draw the cat back.
Will neutering stop my cat peeing outside the box?
- If the problem is spraying, neutering usually reduces it a lot, International Cat Care says, though some neutered cats still spray. If your cat is squatting and peeing, neutering will not fix a medical or tray problem. Your vet can tell which it is.
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Sources
Each source was opened and read on the date shown. How Petym checks its sources
- Cornell Feline Health Center: Feline Lower Urinary Tract Disease (opens in a new tab)
- Merck Veterinary Manual: Urethral obstruction in small animals (opens in a new tab)
- International Cat Care: Feline lower urinary tract disease (updated 28 November 2025) (opens in a new tab)
- International Cat Care: Soiling indoors (updated 26 September 2025) (opens in a new tab)
- VCA Animal Hospitals: Cat behavior problems: house soiling (opens in a new tab)
- International Cat Care: Urine spraying in cats (updated 26 September 2025) (opens in a new tab)
- Battersea Dogs and Cats Home: Cat litter trays (opens in a new tab)