Short answer: A cat peeing outside the litter box often has a medical problem, such as bladder inflammation, urinary stones, kidney disease, diabetes or joint pain, so see your vet first. If your cat is healthy, the cause is usually the box itself (dirty, too few, too small, badly placed) or stress.
Finding a puddle on the rug is frustrating, but it’s also a message. It’s not revenge: the Cornell Feline Health Center says cats probably don’t have the kind of thinking needed for that sort of payback. Instead, Cornell points to medical problems, an aversion to the litter box, or a preference for peeing somewhere else. Stress plays a part too. Working through those causes in order is the best way to solve it.
VCA Animal Hospitals is clear about where to start: the first step is to have your cat examined by your veterinarian.
What medical problems make a cat pee outside the box?
Pain is a big factor: Cornell notes that inflammation of the urinary tract can make urinating painful, which is one reason a cat may start avoiding the box.
Lower urinary tract disease (FLUTD)
For feline lower urinary tract disease, Cornell lists the most common signs as difficult or painful urination, peeing more often, crying out while urinating, blood in the urine, urinating outside the litter box, and frequent licking of the genital area.
Idiopathic cystitis
“Idiopathic” means no specific cause can be found. According to Cornell, feline idiopathic cystitis (FIC) is a painful bladder condition and the most common diagnosis in cats with urinary signs. Cornell says stress seems to be an important factor, including living with other cats and changes in routine. The ASPCA calls interstitial cystitis very serious and potentially life-threatening, and says it must be treated by a veterinarian right away.
Urinary stones, plugs and blockages
Cornell names urinary stones and urethral plugs (made of minerals, cells and a mucus-like protein) as other common causes. The ASPCA notes that a cat with kidney stones or a blockage may be in pain and may meow or cry when trying to go.
Kidney disease, diabetes and thyroid disease
Cornell lists kidney and thyroid diseases, as well as diabetes, as possible culprits. VCA explains that conditions like kidney disease and diabetes can make a cat produce more urine. If your cat is also drinking more, read our guide to the early signs of kidney disease in cats.
Arthritis and other age-related changes
VCA says cats with orthopedic or neurologic pain may feel discomfort stepping into a traditional litter box. Cornell adds that age-related diseases affecting mobility or thinking can make it hard for an older cat to reach the box in time. If your cat is getting on in years, our guide to when a cat becomes a senior covers signs of aging and how often to see the vet.
Is a male cat straining to pee an emergency?
Yes. Cornell says male cats are at greater risk of a urethral obstruction, and that a blocked cat may strain to urinate, make frequent attempts, and produce little if any urine, often crying out in pain. Cornell calls a urethral obstruction “an absolute emergency, requiring immediate veterinary treatment,” and warns that death can follow in less than 24 to 48 hours. If your cat (especially a male) is straining in the box with little or nothing coming out, call your vet or an emergency clinic now.
What litter box problems cause peeing outside the box?
Once your vet rules out a medical cause, look hard at the setup.
- A dirty box. The ASPCA says to scoop at least once a day. Cornell recommends removing waste and clumps daily and scrubbing the box with a gentle detergent when you change the litter.
- Not enough boxes. Cornell and the ASPCA both advise one box per cat, plus one extra.
- A box that’s too small or hard to enter. VCA says cats usually prefer boxes about 1.5 times their body length. Cornell notes that elderly cats and cats with mobility problems need low sides.
- The wrong litter. Cornell says most cats prefer unscented, finer-textured litter about one to two inches deep. The ASPCA agrees most cats prefer clumping, unscented litter.
- Lids and liners. The ASPCA says most cats don’t like box liners or lids. Cornell notes most cats prefer an uncovered box that lets odors escape and gives a 360-degree view.
- A bad location. Cornell says cats want a quiet, private spot separate from their feeding area. The ASPCA adds that cats like multiple escape routes, so avoid tucking the box into a tight corner or a loud, busy room.
Is it stress or marking?
The ASPCA notes that cats sometimes stop using their boxes when they feel stressed, and that changes such as moving can play a part. Cornell mentions a new cat in the home or outdoor cats nearby as triggers for spraying.
It also helps to know whether you’re seeing marking or toileting. Cornell explains that cats usually spray on vertical surfaces, such as walls or the backs of chairs: a spraying cat stands, lifts its tail and quivers, leaving small amounts of urine. A cat that squats and leaves a puddle on the floor is usually toileting. VCA says marking is often triggered by anxiety or frustration, and the ASPCA notes that it’s treated differently from litter box avoidance, so tell your vet which one you’re seeing.
How do you stop a cat from peeing outside the litter box?
1. Start with a vet visit
VCA recommends an exam and lab tests such as a urinalysis. VCA also notes that house soiling can continue even after a physical problem has cleared up, so some behavior work is often still needed.
2. Fix the box setup
Add boxes until you have one per cat plus one, scoop daily, and use a large, uncovered box with one to two inches of unscented litter. If you change litter, Cornell suggests doing it gradually, adding small amounts of the new litter to the old.
3. Put a box where the accidents happen
VCA notes that when a box is placed near the cat’s preferred spot, it is often used right away. In a large home, VCA suggests a box on each floor.
4. Lower the stress
Cornell recommends environmental enrichment to reduce stress, keeping litter boxes in quiet, safe areas, and minimizing major changes in routine.
5. Never punish
The ASPCA says not to rub your cat’s nose in urine or carry them to the box after an accident. Cornell says never to hit, kick or scream at a cat, and warns that the anxiety punishment causes may actually make house soiling worse.
How do you clean cat pee so they don’t go there again?
Clean as soon as you find an accident: Cornell says cleaning is most effective when done soon after soiling. The ASPCA recommends an enzymatic cleanser designed to neutralize pet odors, and VCA suggests the same. Skip ammonia. The ASPCA warns that ammonia-based cleaners can attract a cat back to the same spot, and Cornell says to avoid ammonia and vinegar because they smell like urine.
Products that fit
If you’re cleaning up an accident, the ASPCA and VCA both recommend an enzymatic cleaner. Two well-reviewed options:
Nature’s Miracle Cat Urine Destroyer Plus
Enzymatic cleaner made for cat urine messes.
See on Amazon →Rocco & Roxie Enzyme Stain & Odor Eliminator
Enzyme-based cleaner for pet urine stains and odors.
See on Amazon →As an Amazon Associate we earn from qualifying purchases. Prices change often, so we don’t list them.
When to call the vet
- Right away (emergency): your cat is straining in the box and passing little or no urine, especially a male cat, or is crying out in pain.
- Soon: any new peeing outside the box, blood in the urine, frequent trips with small amounts, crying while urinating, or frequent licking of the genital area.
- At your next visit, or sooner: your cat is drinking or peeing more than usual, or seems stiff getting into the box.
We’re not vets. This article is general information from veterinary sources, not a diagnosis. If your cat is peeing outside the box, see your veterinarian first, and treat straining with little or no urine as an emergency.
Frequently asked questions
Do cats pee outside the litter box out of spite?
Probably not. Cornell says cats likely don’t have the kind of thinking needed for revenge. Medical problems, litter box issues and stress are the usual causes, and Cornell warns that punishment can make house soiling worse.
What’s the difference between spraying and peeing outside the box?
Spraying is marking: Cornell says cats usually spray small amounts on vertical surfaces while standing with the tail raised and quivering. A cat that squats and leaves a puddle on a flat surface is usually toileting. Tell your vet which one you see, because they’re handled differently.
What should I clean cat pee with?
The ASPCA recommends an enzymatic cleanser designed to neutralize pet odors. Avoid ammonia-based cleaners, which can attract your cat back to the same spot, and clean as soon as you find the accident.
For more on why cats do what they do, visit our Cat Behavior section.
