Why has my cat started eliminating outside the litter box?

Inappropriate elimination can stem from physical discomfort (such as digestive or urinary problems), environmental stress, or litter box-related issues. Observe for other symptoms and consult your vet to rule out medical causes first.

What can I observe at home before the vet visit?

Note when symptoms began, how often vomiting or diarrhoea occurs, changes in water intake, and the appearance of stools. Photos or videos are also helpful for your vet.

Is it useful to bring a faecal or urine sample to the appointment?

Yes. A fresh faecal or urine sample can assist in checking for parasites, infection, or urinary specific gravity. Refrigerate the sample and bring it in as soon as possible.

When should I take my cat to an emergency vet immediately?

Seek emergency care immediately if your cat is unable to urinate, vomiting persistently and severely, or showing sudden changes in consciousness. When in doubt, contact your vet clinic right away.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Cat Inappropriate Elimination: Symptoms, Diagnosis & Home Care [2025]

Inappropriate elimination in cats can be caused by environmental stress, litter box issues, or urinary tract disease. Ruling out medical causes first is essential before addressing environmental and behavioural adjustments. Providing adequate litter boxes and resources is key.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap editorial team

Sources: ISFM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Persistent inability to urinate or defecate on their own for more than several hours
•Severe vomiting with inability to eat, or frequent dry heaving
•Sudden lethargy with no response to calling for more than several minutes

Schedule a veterinary visit soon (within 24-72 hours)

•Increasing episodes of urinating or defecating indoors
•Marked decrease in appetite for more than one day, while still eating small amounts
•Repeated diarrhea or intermittent vomiting, but still able to move around

01What symptoms indicate something is wrong?

Indoor elimination is often accompanied by other physical or behavioural changes. Monitor appetite, elimination patterns, and general demeanour to help your vet identify the underlying cause.

Noticeably reduced appetite or refusal to eat for more than 24 hours
Frequent vomiting of food or yellow bile
Repeated diarrhoea or stools containing blood or mucus
Changes in urination frequency or volume, or urinating indoors
Noticeably increased or decreased water intake
Appearing uncomfortable, hiding from touch, or vocalising in pain

02How to assess the situation at home: key observations and emergency criteria

Keeping detailed records at home helps the vet quickly grasp the progression of the problem and prioritise next steps. Photos or videos can provide crucial information — bring your notes to the appointment.

Note when symptoms started and how often they occur
Record the number and timing of vomiting or diarrhoea episodes each day
Weigh or estimate daily water intake changes
Observe stool shape, colour, and whether the litter box is being used
Photograph or video any abnormal behaviour or elimination sites
List recent dietary changes, food transitions, or medication timelines

03How will the vet diagnose the problem? Common diagnostic tests

On arrival, the vet will begin with a physical examination and then order blood, urine, and imaging tests based on clinical findings to identify any underlying medical conditions or complications.

Physical examination

assessment of temperature, abdominal palpation, and overall demeanour

Complete blood count (CBC)

checking for anaemia or signs of infection

Biochemistry panel

evaluating liver, kidney, and electrolyte status

Urinalysis

including specific gravity, sediment microscopy, and infection markers

Abdominal X-ray or ultrasound

assessing the gastrointestinal and urinary tracts for abnormalities

Advanced imaging (CT scan) or specialist referral

for complex or refractory cases

04How to treat and care for your cat after diagnosis: medication, diet, and home care

Once a treatment plan is established based on test results, ongoing monitoring of symptoms, dietary adjustments, and follow-up visits are essential to confirm effectiveness and watch for side effects.

Continuously monitor appetite, vomiting, and stool consistency
Adjust to a prescription or therapeutic diet as directed by your vet
Attend follow-up appointments to review blood or imaging results
If medication is prescribed, monitor for and report any side effects
Home care: ensure adequate water intake and a calm, quiet resting environment
If symptoms worsen, arrange a specialist referral or further investigations promptly

05What to prepare before the vet visit: key steps to help your vet quickly identify the cause

Write down when symptoms started and how they have changed over time

Record daily food intake and the number of elimination episodes

List the names of any current medications and supplements

If possible, bring a fresh faecal or urine sample

Bring any previous test reports or imaging files

Use a secure, comfortable carrier and book your appointment in advance

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.