# Why Your Cat Keeps Pooping in the Bathtub If your cat keeps pooping in the bathtub, the most common reasons are a medical problem that makes pooping painful or urgent, litter box aversion, or stress in the home. Cats often pick a bathtub because it is cool, smooth, quiet, and easy to dig in, which makes it feel like a safe bathroom to them. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Any sudden change in where your cat poops deserves a veterinary visit first, because diarrhea, pain, and constipation are common triggers. - Cats prefer large boxes (at least 50 cm, roughly 20 inches) with clumping clay litter, and giving them that setup improves house-soiling [1]. - A clean box matters. Scoop at least daily and fully replace litter regularly, since litter hygiene is linked to house-soiling [2]. - Fearful cats are more prone to litter box problems, so reducing stress and adding hiding spots can help [3]. - Never punish your cat. Punishment increases fear and makes the problem worse. ## Why Cats Choose the Bathtub Cats are picky about where they eliminate. A bathtub checks several boxes at once. The surface is cool and smooth. It is usually in a quiet room with a door. It is easy to scratch at, and any mess is contained. From your cat's point of view, the tub may simply be a better bathroom than the litter box you provided. House-soiling is the most common problem cat owners face, and it is a leading reason cats are surrendered to shelters [1]. That tells you something important. This behavior is common, it has real causes, and it usually responds to the right changes. ### Normal Reasons First Some bathtub pooping is not a sign of illness at all. It can be a preference problem. - The litter box is too small. Cats preferred boxes measuring at least 50 cm (about 20 inches) in one study [1]. - The litter is the wrong type. Cats preferred clumping clay litter over other options [1]. - The box is dirty. Litter cleaning frequency is associated with house-soiling [2]. - The box is in a bad spot. A box next to a noisy appliance or in a busy hallway can feel unsafe. - Another cat is guarding the box. Tension around resources pushes cats to find new spots. A comfortable litter environment that combines a large box and clumping clay litter promoted normal elimination and reduced house-soiling for both urination and defecation [1]. That is a strong hint that many cases are fixable with setup changes alone. ## Medical Causes to Rule Out First Before you assume this is behavioral, get your cat checked. Pain and digestive upset are common reasons a cat stops using the box. ### Diarrhea and Urgency When stool is loose, your cat may not be able to make it to the box in time. The tub is often closer, or it feels like a safe place to squat. Diarrhea has many causes, including diet changes, parasites, infections, and inflammatory conditions. Your veterinarian can sort these out with a physical exam and stool testing. ### Pain While Pooping Anal gland problems, constipation, and arthritis can all make pooping hurt. Cats learn fast. If the litter box is associated with pain, they look for somewhere else. Older cats with sore hips may struggle to climb into a high-sided box, so they choose the low, flat tub floor instead. ### Other Medical Triggers Any condition that changes bowel habits can play a role. This includes thyroid disease, kidney disease, and intestinal disease. Your veterinarian will decide which tests are needed based on your cat's age, history, and exam findings. If your cat is also having urinary problems, that changes the picture. Urinary issues can be emergencies, especially in male cats. Read more about [why is my cat peeing outside the litter box](/knowledge/veterinary-medicine/symptom-guides/cat-peeing-outside-litter-box) and [what can cause a urinary tract infection in a cat](/knowledge/veterinary-medicine/clinical-methods/what-can-cause-a-urinary-tract-infection-in-a-cat). ## When Bathtub Pooping Becomes a Problem Occasional accidents are one thing. A pattern is another. It becomes a problem when: - It happens more than once or twice. - Your cat stops using the litter box for poop entirely. - You see straining, crying, or blood. - Your cat hides, eats less, or seems uncomfortable. - The behavior starts suddenly in an adult cat with a clean history. Sudden changes in an adult cat are a red flag for a medical cause. Long-standing patterns are more likely to have a behavioral component, but medical causes still need to be excluded first. ## What to Do: A Step-by-Step Plan Work through these steps in order. Do not skip the veterinary visit if the behavior is new. ### Step 1: Get a Veterinary Exam Schedule a visit. Bring a fresh stool sample if you can. Your veterinarian will check for pain, parasites, and other medical causes. If a medical problem is found, treating it often resolves the behavior. ### Step 2: Fix the Litter Box Setup This is where most owners see quick results. - Size: Use a box at least 50 cm (about 20 inches) long. Bigger is better for most cats [1]. - Litter: Offer clumping clay litter, which cats preferred in one study [1]. - Number: The general rule is one box per cat plus one extra. More boxes reduce competition. - Location: Put boxes in quiet, low-traffic spots with more than one exit route. - Cleaning: Scoop at least once daily and fully replace litter on a regular schedule. Litter hygiene is linked to house-soiling [2]. ### Step 3: Make the Bathtub Less Appealing You are not punishing your cat. You are changing the surface. - Keep the tub dry. A dry tub is less appealing than a cool, smooth one. - Place a rubber mat or a shallow tray with a different texture in the tub. - Close the bathroom door when you are not using it. - Do not leave standing water or soft rugs in the tub. ### Step 4: Reduce Stress Fearful cats are more prone to litter box issues [3]. Look for stress sources. - New pets, new people, or a move. - Construction noise or changes in routine. - Other cats blocking access to boxes. - Lack of hiding spots and vertical space. Add hiding spots, cat trees, and separate feeding and watering stations. Give your cat predictable routines. If you have multiple cats, make sure each one has its own resources. ### Step 5: Reward Good Behavior When your cat uses the box, do not make a fuss. Just keep the box clean and comfortable. Cats respond to a predictable, low-stress environment. If you catch your cat about to go in the tub, gently redirect to the box without scaring them. ### Step 6: Track the Pattern Keep a simple log. Note the time, what the stool looked like, and where it happened. This helps your veterinarian spot patterns. It also helps you see whether your changes are working. ## What Not to Do ### Do Not Punish Your Cat Never rub your cat's nose in it, yell, or use a spray bottle. Punishment increases fear and stress. Fearful cats are more likely to have litter box problems [3]. Punishment can make the behavior worse and damage your relationship with your cat. ### Do Not Lock Your Cat in the Bathroom Confinement without a proper litter box setup does not teach your cat where to go. It adds stress. If you need to limit access, provide a clean, large box in the space. ### Do Not Assume It Is Just Behavior Many owners jump to training before ruling out medical causes. Diarrhea, pain, and constipation are common and treatable. Start with your veterinarian. ### Do Not Use Ammonia-Based Cleaners Ammonia smells like urine to cats and can attract them back to the spot. Use an enzymatic cleaner made for pet messes. ### Do Not Ignore Urinary Signs If your cat is also peeing outside the box, straining, or crying, that is a different and sometimes urgent problem. Learn more about [why is my cat suddenly peeing on the couch](/knowledge/veterinary-medicine/anxiety-and-behavior-support/cat-suddenly-peeing-on-couch) and [why is my cat suddenly peeing on my clothes](/knowledge/veterinary-medicine/anxiety-and-behavior-support/cat-suddenly-peeing-on-clothes). ## When to Involve a Veterinarian or Behavior Professional Call your veterinarian if: - The behavior is new or sudden. - You see diarrhea, constipation, blood, or straining. - Your cat is losing weight, eating less, or hiding. - The behavior continues after you fix the litter box setup. - Your cat is older and has other health changes. Ask for a referral to a veterinary behaviorist or a certified cat behavior consultant if medical causes are ruled out and the problem persists. Some cats with long-standing, repetitive elimination patterns may need a behavior plan, and in some cases medication. In one review of cats with long-standing unacceptable urination and compulsive-like features, 10 of 11 cats had a positive outcome after 30 days when behavior modification was combined with clomipramine, compared with 1 of 10 cats on behavior modification alone [4]. That does not mean medication is right for every cat. It means that for some persistent cases, a veterinarian-guided plan can make a real difference. ## Limitations and When to Contact a Veterinarian This article cannot tell you what is causing your cat's behavior. Only a veterinarian who examines your cat can do that. Individual cases need a veterinarian. Contact your veterinarian the same day if: - Your cat is straining to poop and nothing comes out. - You see a large amount of blood in the stool. - Your cat is vomiting repeatedly or seems painful. - Your cat is a senior and the behavior started suddenly. Go to an emergency clinic now if: - Your cat is a male and is straining to urinate, crying, or licking the genital area. This can be a life-threatening blockage. - Your cat is collapsed, weak, or breathing hard. - Your cat has not pooped in more than 48 hours and is uncomfortable. For routine concerns, schedule a visit within a few days. Bring notes about when the behavior started, what the stool looks like, and what you have already tried. ## Frequently Asked Questions ### Why does my cat only poop in the bathtub and not the litter box? Your cat may find the tub cooler, quieter, or easier to dig in than the box. It can also mean the box is too small, dirty, or in a stressful spot. Start with a veterinary check and a litter box upgrade. ### Is my cat pooping in the bathtub a sign of illness? It can be. Diarrhea, constipation, and pain while pooping are common medical triggers. A sudden change in an adult cat should always be checked by a veterinarian. ### Should I punish my cat for pooping in the bathtub? No. Punishment increases fear and stress, and fearful cats are more prone to litter box problems [3]. Focus on cleaning the tub, fixing the box setup, and reducing stress instead. ### How often should I clean the litter box? Scoop at least once daily and fully replace the litter on a regular schedule. Litter hygiene is linked to house-soiling, so a clean box is one of the simplest changes you can make [2]. ### Can stress cause my cat to poop outside the litter box? Yes. Stress from new pets, moves, noise, or conflict between cats can trigger house-soiling. Fearful cats are more likely to have litter box issues, so reducing stress and adding hiding spots can help [3]. ## Related Articles - [Why Is My Cat Peeing Outside the Litter Box?](/knowledge/veterinary-medicine/symptom-guides/cat-peeing-outside-litter-box) - [Why Is My Cat Suddenly Peeing on the Couch?](/knowledge/veterinary-medicine/anxiety-and-behavior-support/cat-suddenly-peeing-on-couch) - [Why Is My Cat Suddenly Peeing on My Clothes?](/knowledge/veterinary-medicine/anxiety-and-behavior-support/cat-suddenly-peeing-on-clothes) - [What Can Cause A Urinary Tract Infection In A Cat](/knowledge/veterinary-medicine/clinical-methods/what-can-cause-a-urinary-tract-infection-in-a-cat) - [Why Is My Cat Suddenly Peeing on the Wall?](/knowledge/veterinary-medicine/anxiety-and-behavior-support/cat-suddenly-peeing-on-wall) - [Why Is My Cat Suddenly Peeing on the Carpet?](/knowledge/veterinary-medicine/anxiety-and-behavior-support/cat-suddenly-peeing-on-carpet) - [Why Your Cat Keeps Pooping on the Floor (Not Peeing)](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-pooping-on-floor-causes) - [Why Is My Cat Peeing in the Bathtub? Causes and Solutions](/knowledge/veterinary-medicine/digestive-and-urinary-care/why-is-my-cat-peeing-in-the-bathtub) - [Why Is My Cat Pooping in the Sink? Causes and Solutions](/knowledge/veterinary-medicine/digestive-and-urinary-care/why-is-my-cat-pooping-in-the-sink) ## References 1. [Litter box size and litter type preference and their associated behavioral changes in cats](https://pubmed.ncbi.nlm.nih.gov/40204471/). The Journal of veterinary medical science, 2025. 2. [Factors associated with house-soiling in Italian cats](https://pubmed.ncbi.nlm.nih.gov/37975187/). Journal of feline medicine and surgery, 2023. 3. [Feline litter box issues associate with cat personality, breed, and age at sterilization](https://pubmed.ncbi.nlm.nih.gov/36840938/). Journal of the American Veterinary Medical Association, 2023. 4. [Retrospective Analysis of Compulsive-like Long-Standing Unacceptable Urination in Cats](https://pubmed.ncbi.nlm.nih.gov/41893650/). Veterinary sciences, 2026. ## Further Reading - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)