Vomiting in Dogs and Cats: When Is It an Emergency?
August 19, 2026
Few things are more frustrating for cat owners than finding urine or stool outside the litter box. While it may be tempting to assume your cat is being spiteful, stubborn, or simply “acting out,” cats don't stop using their litter box without a reason.
In many cases, litter-box problems are caused by an underlying medical condition. Other times, stress, changes in the home, or problems with the litter box itself may be responsible.
Understanding the cause is the first step toward getting your cat back to using the litter box consistently.
Medical Problems That Can Cause Litter-Box Problems
If your cat suddenly stops using the litter box, a veterinary examination is a good place to start.
Some of the most common medical causes include:
- Urinary tract infections
- Bladder inflammation or cystitis
- Bladder stones or crystals
- Urinary blockage
- Kidney disease
- Diabetes
- Arthritis or other painful conditions
- Constipation
- Diarrhea or gastrointestinal disease
- Cognitive changes in senior cats
A cat with painful urination may begin associating the litter box with pain and start urinating somewhere else. Cats with arthritis may also have difficulty climbing into a litter box with high sides.
Because cats are very good at hiding illness, a litter-box change may be one of the first signs that something is wrong.
Is Your Cat Urinating or Spraying?
It's helpful to determine exactly what your cat is doing outside the litter box.
Urinating typically involves squatting and leaving a puddle on a horizontal surface such as a floor, carpet, or bed.
Urine marking, or spraying, is different. Cats generally stand with their tail raised and spray a small amount of urine onto a vertical surface such as a wall or piece of furniture.
Spraying is more commonly associated with territorial behavior, stress, or social conflict, although medical problems should still be considered.
Common Litter Box Problems
Even when your cat is healthy, the litter box itself may be the problem. Cats can be surprisingly particular about their bathroom habits. Common litterbox issues include:
Too Few Litter Boxes
A general rule is to have one litter box per cat, plus at least one additional box.
For example, a two-cat household should ideally have three litter boxes. Some multi-cat households need even more litter boxes.
The boxes should also be placed in different areas of the home rather than all grouped together.
Dirty Litter Boxes
Cats often prefer clean litter boxes. Scoop boxes at least once daily and clean them regularly.
The Wrong Type of Litter
Some cats have strong preferences about the type of litter they use. Many prefer unscented, fine-textured litter.
If you need to change litter types, gradually mixing the new litter with the old litter can make the transition easier.
An Uncomfortable Location
Litter boxes should be located somewhere quiet and easily accessible.
Avoid placing them next to loud appliances such as washing machines or dryers, or in areas where your cat may feel trapped or startled.
A Box That's Too Small
Your cat should be able to comfortably turn around and position themselves inside the litter box.
Large cats often need larger boxes than those available at typical pet stores.
Covered vs. Uncovered Boxes
Some cats prefer covered boxes, while others feel more comfortable with an uncovered box.
If you're having litter-box problems, providing different types of boxes can help determine your cat's preference.
What About Stress?
Stress is another very common contributor to inappropriate elimination.
Cats may respond to changes in their environment by urinating or defecating outside the litter box.
Potential stressors include:
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- Moving to a new home
- New people or pets
- Changes in household routines
- Construction or remodeling
- Conflict with another cat
- Changes in access to food, water, or litter boxes
- Being left alone more than usual
- Outdoor cats visible through windows
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Some cats are particularly sensitive to environmental changes.
Providing safe hiding spaces, maintaining predictable routines, and making sure each cat has access to food, water, resting areas, and litter boxes can help reduce stress.
Don't Punish Your Cat
If your cat has an accident outside the litter box, don't punish or yell at them.
Cats don't understand punishment in the way humans do, and punishment can increase anxiety and make the problem worse.
Instead, focus on determining why your cat isn't using the litter box.
Thoroughly clean areas where accidents have occurred with an enzymatic cleaner designed to remove pet urine odors. If the smell remains, your cat may continue to return to the same location.
When Is a Litter-Box Problem an Emergency?
Some urinary problems can become life-threatening very quickly.
If your cat is repeatedly going to the litter box, straining to urinate, crying while attempting to urinate, or producing little or no urine, seek veterinary care immediately.
A urinary blockage is a life-threatening emergency, particularly in male cats. A blocked cat can become critically ill within a short period of time.
Other signs that warrant prompt veterinary attention include:
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- Blood in the urine
- Frequent trips to the litter box
- Straining to urinate or defecate
- Crying or vocalizing while using the litter box
- Sudden changes in urination
- Vomiting or lethargy
- Loss of appetite
- Hiding or acting like they are in pain
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What Will the Veterinarian Do?
Your veterinarian will start with a physical examination and ask questions about your cat's litter-box habits, diet, environment, and behavior.
Depending on your cat's symptoms, testing may include:
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- Urinalysis
- Urine culture
- Bloodwork
- X-rays
- Ultrasound
- Fecal testing
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The recommended testing will depend on your cat's age, symptoms, and medical history.
Finding the underlying cause is important because treatment for a urinary infection is very different from treatment for bladder inflammation, stones, constipation, arthritis, or a behavioral problem.
Don't Ignore Changes in Litter-Box Habits
A cat that suddenly stops using the litter box isn't necessarily being difficult. It's your cat's way of telling you that something has changed.
Medical problems, stress, pain, and litter-box preferences can all contribute to inappropriate elimination. The sooner you identify the cause, the better the chance of resolving the problem and preventing it from becoming a long-term habit.
If your cat has suddenly started urinating or defecating outside the litter box, schedule an appointment with your veterinarian. And if your cat is straining to urinate or producing little to no urine, don't wait—this can be a life-threatening emergency.
