Your cat’s litter tray can reveal important clues about its digestive health. Although cleaning up cat poo is hardly anyone’s favourite task, noticing changes in colour, shape, texture and frequency can help you recognise when something may be wrong.
But what does normal cat poo actually look like? Are hard, dry pellets a sign of dehydration? What does blood or clear mucus mean? And when should diarrhoea become a veterinary concern?
Healthy cat poo is generally medium to dark brown, formed into a log or segmented shape, and firm enough to retain its shape when collected. It should be moist but not watery, and it should not resemble dry, hard stones.
Abnormal stool may be unusually hard, persistently soft, watery, bloody, black and tar-like, or coated in excessive mucus.
However, stool appearance alone cannot identify the underlying disease. Changes may result from diet, parasites, constipation, infections, intestinal inflammation or other health problems.
According to the Cornell Feline Health Center, diarrhoea can have numerous causes, and persistent symptoms require veterinary investigation.
Important: A cat repeatedly straining in the litter tray may be unable to pass urine rather than experiencing constipation. A suspected urinary blockage is a life-threatening emergency, particularly in male cats. Seek immediate veterinary care if your cat is trying to urinate but producing little or no urine.
This guide explains how to assess cat poo, distinguish common abnormalities and recognise warning signs that should never be ignored.
Table of contents
- What Does Normal Cat Poop Look Like?
- Cat Poop Consistency Chart: Normal vs Abnormal
- What Colour Should Healthy Cat Poop Be?
- Why Is My Cat Pooping Hard, Dry Pellets?
- Why Is My Cat’s Poop Soft or Mushy?
- What Causes Watery Diarrhoea in Cats?
- Home Remedies for Mild Cat Diarrhoea or Liquid Stool
- What Does Red Blood in Cat Stool Mean?
- Why Is There Clear Mucus on My Cat’s Poop?
- Can a Constipated Cat Have Watery Poop?
- When Is Abnormal Cat Poop an Emergency?
- Abnormal Poop in Kittens: Why Extra Caution Is Needed
- How to Collect a Cat Stool Sample for the Vet
- How to Prevent Common Stool Problems in Cats
- Common Mistakes When Assessing Cat Poop
- Frequently Asked Questions
- Final Verdict: How to Tell If Cat Poop Is Abnormal
What Does Normal Cat Poop Look Like?
Normal cat poo is usually brown, well formed and reasonably easy to collect.
Its appearance can vary somewhat with diet, hydration and individual digestive habits.
For most healthy cats, typical stool has several characteristics:
- Colour: Medium to dark brown.
- Shape: Formed into a log or connected segments.
- Consistency: Firm but not excessively hard.
- Moisture: Slightly moist rather than dry or watery.
- Collection: Retains its shape when picked up.
- Frequency: Relatively consistent for the individual cat.
Some healthy cats defecate daily, while others have a different regular pattern.
The most useful comparison is often your cat’s normal routine.
A sudden change in stool frequency, texture or appearance deserves attention, particularly when accompanied by changes in appetite, activity or behaviour.
Should Cat Poop Smell?
Cat poo normally has an unpleasant odour.
However, unusually strong or persistent changes in smell may occur with dietary changes or gastrointestinal problems.
Smell alone cannot diagnose an infection, food intolerance or parasite.
If an unusual odour occurs alongside diarrhea, vomiting, weight loss or other symptoms, arrange veterinary advice.
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Cat Poop Consistency Chart: Normal vs Abnormal
Veterinary professionals may use faecal scoring charts to describe stool consistency.
For this guide, the seven-point Purina faecal scoring system is used.
Scores 2–3 generally represent formed stools. Score 1 indicates very hard stool, while higher scores represent increasingly soft or watery faeces.
Other scoring systems exist, including a five-point chart used by Royal Canin. Their numbers should not be treated as interchangeable.
Seven-Point Cat Stool Chart
| Stool score | Appearance | What it may indicate | Recommended action |
|---|---|---|---|
| 1 — Very hard | Small, dry, separate pellets | Possible constipation | Check urination; seek veterinary advice for straining, pain or repeated hard stools |
| 2 — Firm | Firm, segmented, pliable stool | Generally normal | Monitor routine |
| 3 — Formed | Moist, log-shaped stool holding its form | Generally normal | Maintain appropriate diet and care |
| 4 — Very moist | Soft stool that may lose its shape when collected | Mildly abnormal consistency | Watch for recurrence or other symptoms |
| 5 — Soft piles | Very moist stool retaining limited shape | Loose stool | Contact vet if persistent or recurrent |
| 6 — Mushy | Unformed, mushy piles | Diarrhoea | Seek veterinary guidance, especially if repeated |
| 7 — Watery | Liquid stool without a defined shape | Watery diarrhoea | Prompt assessment; urgent if frequent, severe or accompanied by illness |
These scores describe physical consistency, not specific diseases.
A score of 7 does not reveal whether diarrhoea is caused by parasites, infection, dietary changes or another condition.
Likewise, a score of 1 does not prove dehydration.
How to Use the Stool Chart
Observe the stool before cleaning the litter tray.
Consider:
- Does it retain a recognisable shape?
- Is it excessively hard or unusually watery?
- Has the colour changed?
- Is blood or mucus visible?
- Is your cat passing stools more or less frequently?
- Has your cat’s appetite or behaviour changed?
Taking a photograph of unusual stool may help your vet understand what you’ve observed.
However, photographs do not replace veterinary examination or laboratory testing.
What Colour Should Healthy Cat Poop Be?
Healthy cat poo is generally brown.
The exact shade can vary depending on food composition, digestion and other normal factors.
However, certain colour changes deserve closer attention.
Cat Poop Colour Guide
| Stool colour | Possible explanation | When to seek veterinary advice |
|---|---|---|
| Medium to dark brown | Generally normal | If other symptoms appear |
| Yellow or orange | Diet changes, altered intestinal transit or digestive conditions | If persistent or associated with illness |
| Green | Diet-related changes or altered transit | If recurrent or accompanied by diarrhoea |
| Pale grey or clay-coloured | Possible digestive or bile-related abnormalities | Arrange veterinary assessment |
| Bright red streaks | Fresh blood from the lower bowel or anal area | Contact vet; urgent if bleeding is substantial or cat is unwell |
| Black, sticky and tar-like | Possible digested blood | Seek urgent veterinary assessment |
Colour changes do not provide a complete diagnosis.
For example, yellow stool alone does not establish liver disease or intestinal infection.
Brown Cat Poop
Brown is generally the expected colour.
A consistent medium-to-dark-brown stool that retains its shape is usually reassuring when your cat otherwise appears well.
Yellow Cat Poop
Yellowish stool may reflect dietary changes, rapid intestinal transit or several gastrointestinal conditions.
If the stool is persistently yellow, watery or accompanied by vomiting, weight loss or poor appetite, veterinary investigation is appropriate.
Green Cat Poop
Green stool can sometimes occur after dietary changes or when intestinal contents move through the digestive tract differently.
It is not possible to determine the cause from the colour alone.
Seek veterinary guidance if the change persists or occurs with other symptoms.
Pale Grey or Clay-Coloured Cat Poop
Very pale or unusually grey stool may indicate a digestive or hepatobiliary problem.
However, stool colour alone cannot confirm a disorder involving the liver, bile ducts or pancreas.
A persistent unexplained pale colour warrants veterinary assessment.
Bright Red Cat Poop
Fresh red blood may appear as streaks on the stool, drops around it or blood mixed with loose faeces.
Possible explanations include lower intestinal irritation, constipation-related injury, parasites and other conditions.
The amount of blood and your cat’s overall condition determine the urgency.
Black, Tar-Like Cat Poop
Black, sticky, tar-like stool may indicate melaena, the passage of digested blood.
This can occur when blood has entered the digestive tract and undergone digestion.
Not every dark stool contains blood, and some foods or medicines can change stool colour.
However, black tar-like poo is a warning sign that warrants urgent veterinary assessment.
The PDSA’s guidance on blood in cat poo explains the significance of fresh and digested blood.
Why Is My Cat Pooping Hard, Dry Pellets?
Small, hard, dry pellets may indicate constipation.
Constipation occurs when stool becomes difficult to pass or remains in the large intestine longer than normal.
As stool stays in the colon, more water may be absorbed, making it harder and drier.
Possible Causes of Hard Cat Poop
Several factors may contribute:
- Reduced water intake.
- Pain or difficulty passing stool.
- Reduced intestinal movement.
- Certain medications.
- Reduced mobility.
- Underlying neurological or metabolic conditions.
- Chronic constipation.
- Megacolon.
Dehydration may contribute, but hard stool is not proof that dehydration is the only problem.
What Is Megacolon?
Megacolon is a condition involving severe enlargement and impaired function of the colon.
Cats affected by megacolon may experience persistent or recurrent constipation.
It requires veterinary diagnosis and management.
Do not assume that a fibre supplement or more drinking water can resolve established megacolon.
Signs Your Cat May Be Constipated
Possible signs include:
- Passing small, hard pellets.
- Repeated attempts to defecate.
- Reduced stool production.
- Pain or vocalisation in the litter tray.
- Reduced appetite.
- Vomiting.
- Lethargy.
- Abdominal discomfort.
Could Straining Mean a Urinary Blockage?
Yes. This is one of the most important distinctions in feline healthcare.
A cat repeatedly visiting the litter tray and straining may be trying unsuccessfully to urinate.
Urinary obstruction is particularly dangerous in male cats because their urethra is relatively narrow.
Warning signs may include:
- Repeated litter-tray visits.
- Producing only drops of urine or none.
- Crying or showing distress.
- Excessive licking around the genitals.
- Vomiting.
- Weakness or collapse.
If your cat may be unable to urinate, seek emergency veterinary care immediately.
Do not wait to find out whether the problem resolves on its own.
The 2025 international feline urinary tract disease guidelines emphasise the importance of recognising urethral obstruction promptly.
Can You Treat Constipation at Home?
Mild, occasional dry stool in an otherwise healthy cat may improve with appropriate hydration and dietary management.
However, treatment depends on the cause.
Ensure your cat has access to fresh water and suitable complete food.
Wet food may support water intake in some cats.
Do not automatically add pumpkin, fibre supplements, laxatives or enemas.
Some treatments can be inappropriate or dangerous, particularly when a blockage or underlying disease is present.
The VCA guide to constipation in cats explains why diagnosis matters.
Why Is My Cat’s Poop Soft or Mushy?
Soft stool is less formed than normal poo but may not be completely watery.
A single mildly soft stool is different from frequent, liquid diarrhoea.
Possible causes include:
- A sudden change in food.
- Eating unfamiliar food.
- Stress.
- Intestinal parasites.
- Infections.
- Food-responsive digestive disorders.
- Inflammatory intestinal disease.
- Other gastrointestinal conditions.
It is not possible to identify the cause solely by texture.
Can Changing Cat Food Cause Soft Stool?
Yes.
A sudden change in diet can contribute to digestive upset in some cats.
When changing food for a healthy cat, a gradual transition is often better tolerated.
However, diet changes are not the only possible cause of loose stools.
Persistent diarrhoea should not be dismissed as a normal reaction to food.
Can Stress Affect a Cat’s Poop?
Stress can influence gastrointestinal function.
A change in environment, household routine or other circumstances may coincide with altered bowel habits.
However, stress should not be assumed to be the cause of persistent diarrhoea without considering medical problems.
What Causes Watery Diarrhoea in Cats?
Watery diarrhoea occurs when faeces lose their normal shape and become predominantly liquid.
It may occur once or repeatedly.
Possible causes include:
- Intestinal parasites.
- Viral or bacterial infections.
- Dietary intolerance.
- Sudden food changes.
- Inflammatory intestinal conditions.
- Medication effects.
- Ingestion of unsuitable substances.
- Other systemic illnesses.
Giardia and certain other intestinal parasites can cause diarrhoea, but their presence cannot be confirmed from stool appearance alone.
Why Is Watery Diarrhoea Concerning?
Repeated watery diarrhoea can cause substantial fluid loss.
This may lead to dehydration and electrolyte abnormalities.
Kittens, cats and cats with existing medical conditions may be especially vulnerable.
When Should You Contact a Vet?
Seek veterinary advice promptly if diarrhoea:
- Occurs repeatedly.
- Is very watery.
- Contains blood.
- Is accompanied by vomiting.
- Occurs with poor appetite.
- Causes lethargy.
- Affects a kitten or medically vulnerable cat.
- Continues or repeatedly returns.
Do not wait 24–48 hours when your cat appears seriously unwell.
The Cornell Feline Health Center’s diarrhoea guidance explains why persistent diarrhoea and accompanying symptoms need clinical evaluation.
Home Remedies for Mild Cat Diarrhoea or Liquid Stool
If an otherwise healthy adult cat has one mildly loose stool but continues eating, drinking and behaving normally, close observation may be reasonable initially.
However, watery or repeated diarrhoea should not automatically be managed at home.
1. Keep Fresh Water Available
Ensure your cat has easy access to clean drinking water.
Some cats prefer several drinking locations or a suitable water fountain.
Access to water is important, but it cannot always replace fluid losses caused by significant diarrhoea.
2. Continue Appropriate Feeding
Do not routinely fast a cat for 12 hours to treat diarrhoea.
Cats need adequate nutrition, and prolonged inadequate food intake can have serious consequences.
Continue suitable food unless your veterinary surgeon advises a specific feeding plan.
3. Avoid New Treats and Unnecessary Food Changes
If your cat is otherwise well, avoid introducing unfamiliar foods while monitoring the digestive problem.
Repeatedly changing diets can make it harder to identify what is happening.
4. Keep the Litter Tray Clean
A clean tray makes it easier to monitor stool frequency and appearance.
In multi-cat households, consider how to determine which cat is producing abnormal stool.
5. Record Changes
Note:
- When diarrhoea started.
- Number of episodes.
- Colour and consistency.
- Whether blood or mucus is present.
- Changes in food.
- Appetite and behaviour.
- Vomiting or other symptoms.
This information can help your vet decide what tests are appropriate.
Avoid Unsafe Home Treatments
Do not give human anti-diarrhoeal medicines, antibiotics, mineral oil or unprescribed supplements.
Do not assume that plain chicken and rice provides a nutritionally appropriate treatment for every cat.
Homemade bland diets are not complete feline diets and may be inappropriate for some medical conditions.
What Does Red Blood in Cat Stool Mean?
Visible red blood in stool is called haematochezia.
It commonly indicates bleeding from the lower part of the gastrointestinal tract or surrounding tissues, although the exact source requires investigation.
Possible Causes
Fresh blood may occur with:
- Colitis.
- Constipation-related irritation.
- Anal-area injuries.
- Intestinal parasites.
- Infections.
- Other gastrointestinal disorders.
Some cats may produce a small streak of blood after passing hard stool.
However, even a small amount should not be repeatedly dismissed without veterinary advice.
Is a Small Streak of Blood an Emergency?
A tiny isolated streak in an otherwise well adult cat is not necessarily the same urgency as substantial bleeding.
Nevertheless, contact your veterinary practice for guidance, especially if the problem recurs.
Seek urgent assessment for substantial bleeding, repeated bloody diarrhoea, weakness, collapse, pale gums or obvious distress.
For kittens, bloody stool deserves prompt veterinary attention because young animals can become unwell rapidly.
Why Is There Clear Mucus on My Cat’s Poop?
The intestinal lining naturally produces mucus.
Small amounts normally help stool move through the bowel.
Visible mucus may appear as a clear or jelly-like coating.
What Causes Excess Mucus?
Noticeable mucus can occur when the large intestine becomes irritated.
Possible causes include:
- Colitis.
- Dietary changes.
- Intestinal parasites.
- Infections.
- Food-responsive digestive conditions.
- Other inflammatory problems.
Mucus can appear with otherwise formed stool or accompany diarrhoea.
What if Mucus Appears With Blood?
Blood and mucus together may indicate inflammation of the lower bowel.
However, the appearance alone cannot determine whether the cause is infection, parasites or another condition.
Contact your veterinary practice, particularly if the problem continues or your cat has other symptoms.
Is One Small Amount of Mucus Serious?
A tiny isolated amount may not indicate a major illness in an otherwise well cat.
Persistent, recurrent or substantial mucus deserves investigation.
Can a Constipated Cat Have Watery Poop?
Yes.
In some circumstances, liquid material may pass around retained hard stool.
This is sometimes called overflow diarrhoea.
It can make severe constipation appear similar to ordinary diarrhoea.
Signs That May Suggest Retained Stool
Possible clues include:
- Frequent unproductive straining.
- Small amounts of liquid stool.
- Abdominal discomfort.
- Reduced appetite.
- Vomiting.
- A history of constipation.
These symptoms are not diagnostic.
A veterinarian may need to examine the cat and perform further tests.
Why This Matters
Giving home diarrhoea remedies to a severely constipated cat may delay necessary treatment.
Likewise, assuming a straining cat is constipated when it actually has a urinary obstruction can be life-threatening.
If your cat repeatedly strains or produces very little waste, seek veterinary advice and confirm that urine is being passed normally.
When Is Abnormal Cat Poop an Emergency?
Not every abnormal stool requires emergency hospitalisation.
However, some combinations of symptoms indicate that waiting could be dangerous.
Cat Poop Emergency Decision Chart
| Symptom or situation | Recommended response |
|---|---|
| Straining with little or no urine | Emergency veterinary care immediately |
| Collapse or severe weakness | Emergency veterinary care immediately |
| Significant breathing difficulty | Emergency veterinary care immediately |
| Black, sticky, tar-like stool | Urgent veterinary assessment |
| Large amounts of red blood | Urgent veterinary assessment |
| Bloody diarrhoea with lethargy or vomiting | Urgent veterinary assessment |
| Repeated severe watery diarrhoea | Prompt veterinary assessment; urgent if systemic symptoms |
| Kitten with repeated diarrhoea | Prompt veterinary assessment |
| Painful repeated straining to defecate | Prompt veterinary assessment |
| One mildly soft stool in a bright, healthy adult | Monitor closely and seek advice if it continues |
| Persistent unusual stool colour | Arrange veterinary advice |
Warning Signs Beyond the Stool
Your cat’s overall condition may be more important than the appearance of a single bowel movement.
Seek professional guidance when abnormal stools occur with:
- Refusal to eat.
- Repeated vomiting.
- Marked lethargy.
- Dehydration.
- Significant weight loss.
- Abdominal pain.
- Weakness.
- Difficulty urinating.
Do not wait for a specific number of hours if your cat appears seriously ill.
Abnormal Poop in Kittens: Why Extra Caution Is Needed
Kittens have smaller fluid reserves and can deteriorate quickly during gastrointestinal illness.
Repeated diarrhoea may be associated with parasites, infections, dietary problems or other conditions.
Young kittens may also struggle to maintain normal hydration and energy intake.
Warning Signs in Kittens
Contact a veterinarian promptly if a kitten develops:
- Repeated diarrhoea.
- Watery stools.
- Blood in the stool.
- Vomiting.
- Poor feeding.
- Unusual tiredness.
- Weakness.
- Signs of dehydration.
A very young kitten should not be managed using generic adult-cat home remedies.
The VCA kitten diarrhoea guidance explains the importance of timely care and appropriate testing.
How to Collect a Cat Stool Sample for the Vet
A stool sample may help your veterinarian investigate parasites and certain other digestive problems.
Step-by-Step Collection
Step 1: Use a clean collection tool.
Wear disposable gloves or use a clean scoop.
Step 2: Collect a recent sample.
Choose stool with as little litter contamination as possible.
Step 3: Use a suitable container.
Place the sample in a clean, leakproof container or one supplied by your veterinary practice.
Step 4: Label it.
Record your cat’s identity and the collection time.
Step 5: Follow storage instructions.
Ask the practice whether the sample should be refrigerated and how quickly it must be delivered.
Storage requirements can vary according to the test.
Step 6: Wash your hands.
Clean tools and contaminated surfaces carefully.
Should You Photograph the Stool?
A photograph can be helpful, especially if the colour or consistency changes.
However, it cannot replace laboratory examination.
Your vet may recommend faecal testing or other investigations based on the symptoms.
How to Prevent Common Stool Problems in Cats
Not every digestive condition is preventable, but consistent care can help support normal bowel habits.
Feed a Complete and Balanced Diet
Choose food appropriate to your cat’s age, health and nutritional requirements.
Avoid frequently changing diets without a reason.
Make Food Changes Gradually
When introducing new food for a healthy cat, a gradual transition may reduce digestive upset.
Cats with medical conditions may require a different feeding approach under veterinary guidance.
Support Hydration
Provide clean drinking water in accessible locations.
Some cats may benefit from a suitable water fountain or nutritionally complete wet food.
Maintain Appropriate Parasite Prevention
Follow your veterinary practice’s recommendations for parasite control and testing.
The appropriate programme depends on age, environment, outdoor access and other risks.
Keep Litter Trays Accessible
Provide clean, comfortable trays in quiet locations.
Cats with arthritis or mobility limitations may need low-sided trays.
Monitor Your Cat’s Normal Pattern
Knowing your cat’s usual stool consistency, frequency and litter-tray behaviour can make changes easier to recognise.
Do not rely on stool appearance alone to assess overall health.
Common Mistakes When Assessing Cat Poop
Assuming Every Hard Stool Means Dehydration
Hard pellets may occur with constipation, but the underlying cause can be more complex.
Waiting Two Days While a Cat Strains
A cat struggling in the litter tray may have a urinary blockage.
Suspected inability to urinate is an immediate emergency.
Fasting a Cat With Diarrhoea
Routine fasting is not recommended without veterinary direction.
Giving Human Medicines
Some human gastrointestinal medicines can be dangerous for cats.
Assuming Yellow Stool Means Liver Disease
Colour alone cannot establish a diagnosis.
Ignoring Black, Tarry Stool
This may indicate digested blood and requires urgent veterinary assessment.
Treating Blood or Mucus as Proof of Parasites
Parasites are one possibility, but laboratory testing and clinical assessment may be needed.
Assuming One Normal Stool Means the Problem Is Resolved
Some conditions cause intermittent symptoms.
Persistent or recurring changes should be discussed with a veterinarian.
Frequently Asked Questions
Healthy cat poo is usually brown, formed and moist without being watery. It should retain its shape when collected.
Hard pellets may indicate constipation. Possible contributors include reduced water intake, impaired intestinal movement, pain or underlying medical conditions. Repeated straining requires veterinary assessment, especially if urine output is uncertain.
Fresh red blood may come from the lower bowel or anal region. Possible causes include irritation, constipation, colitis or parasites. Contact your vet, and seek urgent care if bleeding is substantial or your cat is unwell.
Visible mucus may reflect irritation of the large intestine. Dietary changes, parasites and colitis are possible causes, but appearance alone cannot confirm a diagnosis.
Do not routinely withhold food. Cats require appropriate nutrition, and treatment should depend on the cause and severity of symptoms.
Normal stool is generally medium to dark brown. Persistent red, black tar-like, pale or unusually coloured stools may require veterinary assessment.
Not always, but persistent yellow stool may indicate altered digestion or another problem. Seek veterinary advice when it continues or occurs with diarrhea, vomiting or poor appetite.
Possible causes include dietary changes, parasites, infections and other gastrointestinal conditions. Repeated watery diarrhoea can cause dehydration and warrants prompt assessment.
Yes. Liquid material may occasionally pass around retained hard stool. Veterinary examination is needed to distinguish this from ordinary diarrhoea.
Bowel patterns vary. A cat that stops passing stool, repeatedly strains, vomits or appears uncomfortable should be assessed promptly. Do not use a fixed waiting period when concerning signs are present.
Check whether the cat is passing urine. If it may be unable to urinate, seek emergency veterinary treatment immediately.
A fresh sample can be useful when investigating diarrhoea or parasites. Ask the practice how to collect and store it appropriately.
Final Verdict: How to Tell If Cat Poop Is Abnormal
Normal cat poo is generally brown, formed and moist enough to hold its shape.
Small, hard pellets may suggest constipation, while persistent soft or watery stools may indicate gastrointestinal illness.
Fresh red blood, substantial mucus, pale stools or black, tar-like faeces deserve attention, particularly when your cat also shows signs of illness.
However, stool appearance is only one part of assessing your cat’s health. Appetite, energy, hydration, vomiting, pain and litter-tray behaviour are equally important.
Most critically, a cat repeatedly straining without passing urine needs emergency veterinary care.
By learning your cat’s normal bowel habits and recognising meaningful changes, you can identify when closer monitoring is reasonable and when professional assessment is necessary.
