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Urination and/or Defecation outside the Litter Box in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition

Urination and/or defecation outside the litter box refers to behavior where a cat eliminates urine or feces in places other than the designated litter box. This behavior can occur due to both medical and behavioral reasons.

Can Occur with the Following Diseases:

Basics and possible causes

Urination or defecation outside the litter box is a common problem in cats and can be attributed to a variety of causes. The main causes can be broadly divided into medical and behavioral categories. Medical causes include urinary tract infections, bladder infections, kidney problems, and other conditions that cause pain or discomfort during eliminationElimination refers to the process by which waste products and toxins are removed from the body. This includes excretion via the kidneys (urine), intestines (stool), lungs (breath), and skin.. These problems can lead a cat to associate the litter box with pain and try to use other places.

Behavioral causes can be attributed to stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., Uncertainty / disorientation, or dissatisfaction with the litter box itself. Factors such as an Uncleanliness litter box, too few litter boxes in the household, an unfavorable placement of the litter box, or the wrong type of litter can contribute to this behavior. Furthermore, changes in the household, such as moving to a new home or the addition of a new pet, can cause stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and Uncertainty / disorientation in the cat, which can manifest in this undesirable behavior.

Another important aspect is territorial marking, which can also lead cats to urinate outside the litter box. This type of behavior often occurs in unneutered male cats but can also occur in female cats and neutered male cats, especially if they are in a stressful environment or feel they need to defend their territory.

Typical accompanying symptoms

Increased meowing or Restlessness: Cats experiencing Pain during urination or defecation may meow more or behave restlessly. This can be an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition. of Pain or discomfort and should be taken seriously.
Blood in urine or feces: The presence of blood in urine or feces is a serious symptom and can indicate an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., injury, or other health problem.
Altered drinking and eating behavior: Some cats drink or eat less when they are in Pain or stressed. Altered drinking and eating behavior can be an indicator of an underlying problem.
Increased Licking of the genital area: Frequent Licking of the genital area can indicate irritation or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and is another symptom that should be investigated.
Changes in social behavior: Cats who are in pain or stressed may withdraw or show other behavioral changes, such as aggression or increased clinginess or attachment.

When to see a vet?

Eskalation: ORANGE for sudden new onset, Pain during urination or defecation, blood, Vomiting, or . RED for anuria, collapse, or severe weakness.

A veterinarian should definitely be consulted if the cat suddenly starts to urinate or defecate outside the litter box, especially if this is accompanied by other symptoms such as blood in the urine, increased meowing, changes in drinking or eating behavior, or increased Licking of the genital area. These symptoms can indicate serious health problems that require immediate treatment.

Even if no obvious further symptoms are present, a visit to the veterinarian is advisable to determine the underlying cause of the behavior. Early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. can help identify and treat health problems before they worsen. The veterinarian can also provide recommendations to improve your cat’s quality of life to avoid future undesirable behavior.

Symptom recognition for the pet owner and veterinary diagnostic procedure

It is important for the pet owner to pay close attention to the cat’s signs. Observe your cat’s behavior closely, note when and where the undesirable behavior occurs, and look for other accompanying symptoms. This information can help the veterinarian identify the cause of the problem more quickly.

The veterinarian will usually begin with a thorough clinical examination and take a medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. to narrow down the possible causes. This includes questions about changes in the household, the number of litter boxes, the type of litter used, and the cat’s general behavior. Depending on the results of the examination, the veterinarian may perform further diagnostic tests, such as urinalysis, blood tests, or imaging procedures like X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. or ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., to rule out or confirm medical causes.

What the pet owner can do and professional therapy options

As a pet owner, you can take several steps to improve your cat’s well-being and reduce undesirable behavior. One of the first measures should be to ensure a clean and sufficiently available number of litter boxes. A rule of thumb is to have one more litter box than the number of cats living in the household. For example, in a two-cat household, there should be at least three litter boxes.

Place the litter boxes in quiet, easily accessible locations that offer the cat security. Experiment with different types of litter to find out which your cat prefers. Make sure to clean the litter boxes regularly to avoid odors that could deter the cat.

If the problem is stress-related, try to identify and minimize the stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. factors. This could include introducing play and enrichment opportunities, using pheromone diffusers, or creating retreats for your cat. In some cases, it may be necessary to consult with an animal behaviorist to develop specific behavior modification strategies.

It is important to be patient and empathetic, as Behavioral changes require time and consistent training. Avoid punishing your cat, as this can increase stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and worsen the problem. Instead, praise and reward positive behavior to encourage the desired change.

Outlook on current research

Current research in behavioral biology and veterinary medicine has increasingly investigated the problem of urination and defecation outside the litter box. Various studies suggest that environmental factors play a significant role. For example, the placement of the litter box, the type of litter used, or an insufficient number of litter boxes in the household can influence cat behavior. Researchers have found that cats often prefer to have their litter box in a quiet and less frequented part of the house. Additionally, the cleanliness of the litter box can be crucial; cats are known to be clean animals that require a clean environment.

Another important finding from research is the role of stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and social dynamics in the household. Studies show that cats living in multi-animal households are more likely to urinate or defecate outside the litter box, especially if they feel threatened or stressed. Researchers are currently investigating the extent to which pheromones or other chemical signals can be used to regulate cat behavior in multi-cat households and reduce stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being..

The genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. of cats to certain Behavioral changes is also being investigated. Some cat breeds appear to be more susceptible to behavioral problems that could lead to Uncleanliness behavior. This research seeks to identify genetic markers that indicate an increased predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. to such problems. In the long term, this could support the development of targeted breeding programs aimed at minimizing the risk of behavioral problems.

Another area of research deals with the role of health problems in Uncleanliness behavior. While it is well documented that urinary tract infections and other medical problems can lead to changes in litter box behavior, new studies are investigating how chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. Pain, for example due to arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis., affects behavior. Such Pain could make it difficult for cats to get into the litter box or find a comfortable position.

Technological advances also offer new opportunities for investigating and improving cat litter box behavior. Smart litter boxes for cats, which monitor behavior and collect data on the frequency, timing, and duration of litter box use, offer valuable insights and enable early detection of deviations that could indicate health or behavioral problems. Such technologies are currently being further developed and tested to improve their efficiency and user-friendliness.

In summary, research in this field is multifaceted and pursues a combination of environmental adaptations, genetic investigations, and technological progress to address the problem of Uncleanliness behavior in cats. These multidisciplinary approaches are promising and could lead to improved management strategies in the near future that enhance both the well-being of cats and the satisfaction of their owners.

Frequently asked questions

Why is my cat urinating outside the litter box? There are many possible reasons why a cat urinates outside the litter box. These include medical problems such as urinary tract infections or bladder infections, stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. or anxiety, Uncleanliness litter boxes, unsuitable cat litter, or the placement of the litter box in an unfavorable location.
What can I do to get my cat to use the litter box? Make sure the litter box is clean and easily accessible. Use a cat litter that your cat prefers, and ensure the litter box is in a quiet place. If you have multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. cats in the household, you should provide enough litter boxes.
Can stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. be the reason for my cat’s Uncleanliness behavior? Yes, stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can play a big role. Changes in the household, such as a new pet or moving, can cause stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being.. It is important to identify and minimize stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. factors to improve your cat’s behavior.
How often should I clean the litter box? The litter box should ideally be cleaned daily to remove urine and feces. At least once a week, the litter should be completely changed and the litter box thoroughly cleaned to avoid unpleasant odors.
Which types of cat litter are best suited? That depends on your cat’s preferences. Some cats prefer clumping litter, while others prefer non-clumping. It can be helpful to try different types to see which your cat prefers.
My cat suddenly stopped using the litter box. What could be the reason? A sudden cessation of litter box use can indicate a medical problem and should be examined by a veterinarian. StressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. or changes in the environment could also be causes.
Could there be a problem between my cats that is leading to the inappropriate eliminationElimination refers to the process by which waste products and toxins are removed from the body. This includes excretion via the kidneys (urine), intestines (stool), lungs (breath), and skin.? Yes, social tensions between cats in the same household can lead to Uncleanliness behavior. Ensure that each cat has access to its own litter box and that sufficient resources are available to minimize competition.
Can my cat’s age affect their toileting behavior? Yes, older cats may have difficulty using the litter box due to health problems such as arthritisArthritis is an inflammation of the joints that can cause pain, swelling, stiffness, and limited mobility. There are many forms of arthritis, including rheumatoid arthritis and osteoarthritis.. A lower entry height or a larger litter box can help older cats.
What can I do if my cat keeps urinating in the same spot outside the litter box? Clean the area thoroughly with an enzymaticEnzymatic refers to processes catalyzed by enzymes. Enzymes are proteins that accelerate chemical reactions in the body and are essential for metabolism and numerous other vital functions. cleaner to remove odors that might attract your cat. Consider whether it is possible to place an additional litter box in this area.
Should I consult my veterinarian if my cat urinates outside the litter box? Yes, it is advisable to consult a veterinarian to rule out medical causes. The veterinarian can perform tests and recommend appropriate therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. if necessary.