Cat Soiling Indoors

Cats are usually very clean animals and are typically reliable about their toileting habits. Most cats will consistently use a litter tray indoors or toilet outside if they have access to a garden.

If a cat that normally toilets appropriately begins defecating or urinating indoors, it can be worrying for owners. While an occasional accident can happen if a cat is unwell, frightened, or accidentally shut in a room, persistent soiling in the home should always be investigated.

Importantly, cats do not soil indoors out of spite or revenge. This behaviour usually indicates that something in the cat’s environment, health, or routine has changed. Punishing a cat for soiling indoors will not solve the problem and can make the situation worse by increasing fear and anxiety. The most effective approach is to identify and address the underlying cause.

Once a cat has toileted in a particular location, the remaining scent may encourage them to return to the same spot. To help break this habit:

• Clean the area thoroughly using an enzymatic pet odour cleaner designed to remove animal scents.
• Avoid ammonia-based cleaners, which may smell similar to urine for cats.
• Prevent access to the area where possible by temporarily blocking it with furniture or closing doors.
• Changing the layout of the area can also help discourage repeat use.

Illness

Medical conditions such as gastrointestinal upset, diarrhoea, pain, or other health issues can cause a cat to defecate indoors if they are unable to reach their usual toileting area in time.

Possible solution:

If your cat suddenly changes its toileting habits, a veterinary examination is recommended to rule out medical problems. Once the underlying issue is treated, normal habits often return. Some cats may continue to avoid their usual toileting area if they previously associated it with discomfort, so an additional litter tray in another location may help.

Old Age

Older cats may become less willing to go outside in bad weather or may have difficulty using cat flaps due to arthritis or reduced mobility. Senior cats may also feel more vulnerable if other neighborhood cats are nearby.

Possible solution:

Providing an easily accessible indoor litter tray is often very helpful for older cats, with a smaller lip to help their access into the tray. Medical causes should always be ruled out, particularly in senior pets, and an osteoarthritis assessment is recommended.

Fear and Anxiety

Cats may avoid their usual toileting area if they feel unsafe or stressed. Because cats are vulnerable while defecating, they prefer quiet locations where they feel secure and unlikely to be disturbed. For indoor cats, anxiety is often related to changes within the home rather than outdoor threats. Common triggers include:

• Conflict with other cats in the household, including subtle bullying or blocking access to the litter tray
• Dogs or young children approaching or disturbing the cat while toileting
• Litter trays placed in busy or noisy areas, such as near washing machines, dryers, or frequently used doorways
• Sudden changes in the home, such as moving house, renovations, new furniture, or rearranging rooms
• New pets or new family members
• Changes in routine, such as owners returning to work or spending more time away
• If a cat feels unable to access its litter tray safely, it may choose an alternative location where it feels more secure.

Possible solutions:

• Provide multiple litter trays in different quiet areas of the home (ideally one per cat plus one extra).
• Ensure litter trays are located away from food, water, and noisy appliances.
• In multi-cat households, place trays in separate areas so one cat cannot block another’s access.
• Avoid placing litter trays where the cat may feel trapped or cornered.
• Ensure the cat has safe resting and hiding areas where it can retreat from other pets or household activity.
• Reducing stress and improving access to appropriate toileting areas will often help resolve anxiety-related soiling.

Presence of visitors or strangers

Some cats become anxious when unfamiliar people are in the home. If reaching their litter tray or going outside requires passing through a busy area, they may choose to toilet elsewhere.

Similarly, some cats become stressed when their owners are away and may toilet in areas with a strong familiar scent, such as beds.

Possible solution:

• Provide a litter tray in the room where the cat feels safest.
• Keep bedrooms closed when you are away.
• Arrange care from familiar people where possible.

Cats can be very particular about their toileting environment. Problems can occur if:

• There are too few litter trays
• The tray is too small
• The litter is strongly scented
• The tray is in a busy or noisy area
• The tray is not cleaned frequently.

A helpful rule is to provide one litter tray per cat, plus one extra, placed in quiet and accessible locations.

Many cats prefer large, uncovered trays with unscented litter that are cleaned regularly.

Many cases of indoor soiling can be resolved by addressing environmental factors and litter tray management. However, if the problem continues or appears suddenly, it is important to speak with your veterinarian to rule out underlying medical or behavioural causes and ensure our feline friends are as happy and healthy as possible!