Why Is My Cat Peeing Outside the Litter Box? Causes and Fixes

By Tailwisp Editorial TeamUpdated October 20, 20264 min read

Finding a puddle on the carpet is frustrating, but it is one of the most common reasons cats are brought to vets and surrendered to shelters. The most important thing to know is that the cat is not being spiteful. Something is wrong, and it can almost always be found and often fixed.

First, rule out an emergency

If your cat is straining in the litter box, making repeated trips with little or no urine, crying, licking the genital area or has blood in the urine, call a veterinarian right away. A male cat can develop a urethral blockage, which is a life-threatening emergency. Without treatment, a blocked cat can die within a day or two. See the emergency warning signs guide, and use our US vet directory to find emergency care.

Medical causes

A vet visit should be the first step, with a urinalysis and possibly blood tests and imaging. Medical reasons include:

• Urinary tract disease. Inflammation, infection, crystals and stones make urination painful, so a cat may associate the box with the pain.
• Kidney disease. Increased thirst leads to larger volumes of urine.
• Diabetes. Excess glucose causes more urine and thirst.
• Hyperthyroidism. Can increase urination.
• Arthritis. Painful joints may make high sides or stairs hard, so the cat goes where it is easier.
• Cognitive dysfunction. Older cats may forget where the box is.
• Constipation or digestive issues.

Litter box problems

If the vet gives a clean bill of health, look at the box setup.

Cleanliness. Scoop at least once, and ideally twice, daily and wash the box with mild soap every week or two.

Number. Aim for one box per cat plus one extra, spread across the home.

Location. Choose quiet, easily accessed places away from noisy appliances and food. Avoid dead ends where a cat can be ambushed.

Size. The box should be about one and a half times the cat's length. Many commercial boxes are too small.

Type. Many cats dislike covered boxes, which trap odor and feel cramped. Try an open box.

Litter. Cats generally prefer unscented, fine-grained clumping litter. Changing brand suddenly can cause avoidance.

Liners and cleaners. Strong scents, liners and harsh cleaners can put cats off.

Stress and territory

Cats may urinate outside the box when stressed or when they feel their territory is threatened. Triggers include:

• A new pet, baby or person
• Moving or renovations
• Conflict between cats in the household
• Outdoor cats visible through windows
• Changes in routine

Distinguish between inappropriate urination, where the cat squats on horizontal surfaces, and spraying, where the cat backs up to a vertical surface with a raised tail and sprays a small amount. Neutering reduces spraying in most cats. Our indoor cat enrichment ideas can reduce boredom and tension, and our cat behavior guides explain stress signals.

Cleaning up properly

Cat urine contains compounds that cats can smell long after humans cannot. Use an enzymatic cleaner made for pet urine. Blot up as much as possible first, saturate the area with cleaner, let it work as directed and let it air dry. Avoid ammonia-based cleaners, since ammonia smells like urine to a cat. A black light can help you locate old spots.

Step-by-step plan

1. Check for emergency signs, and call a vet if present.
2. Schedule a veterinary exam with a urine test.
3. Clean the box to a high standard and add boxes where needed.
4. Try different litter and box types in a "cafeteria" test, with several options side by side.
5. Clean accident spots with enzymatic cleaner.
6. Reduce stress and add enrichment, vertical space and hiding places.
7. Ask your vet about behavior specialists, pheromone products or medication if the problem persists.

Do not punish

Rubbing a cat's nose in urine, scolding or confining it to a small space after the fact does not work and makes the problem worse. A cat cannot link punishment to an event from earlier.

Special situations

Senior cats. Arthritis and cognitive changes are common causes. Provide boxes with a low entry, put them on every floor and keep them near where the cat rests.

Multi-cat homes. One cat may guard the box or ambush others. Add boxes in separate locations rather than side by side.

After a move or a new pet. Return to basics, give the cat a safe room and re-introduce the household in stages.

After a vet visit or boarding. Some cats pick up the smell of other animals, and a short period of stress-related accidents is not unusual.

Keeping a record

Write down when and where accidents happen, what the urine looks like and any changes in appetite, thirst or weight. A simple diary helps your vet and any behavior specialist see patterns quickly. Take a photo of the spot and of any blood in the urine, and bring a fresh urine sample if your vet asks for one.

Cost and when to get help

Vet exams and urine tests are an investment, but untreated urinary disease can become costly and dangerous. Read about cat vet visit costs to plan. If the problem continues after medical issues are ruled out, a veterinary behaviorist can help create a tailored plan.