Most cats pass stools about once a day, though it varies. If your cat is visiting the litter box without results, straining, or producing small, hard, dry droppings, they may be constipated. Cat constipation is common and often mild, but it can become serious if it keeps happening or is left too long. This guide explains the usual causes, gentle steps you can take at home, and the warning signs that mean your cat needs a vet.
This is general information, not veterinary advice. If you are worried about your cat, contact your vet.
Signs Your Cat May Be Constipated
Watch for:
- Fewer stools than usual, or none for a day or two
- Hard, dry, small stools, sometimes found outside the litter box
- Straining, crying or crouching in the litter box for a long time
- Small amounts of liquid stool or mucus, which can seep around a hard blockage and be mistaken for diarrhoea
- Reduced appetite, vomiting or lethargy
- A tense or uncomfortable belly, or reluctance to be picked up
Important: straining in the litter box is not always constipation. A cat, especially a male cat, straining to urinate and producing little or no urine may have a urinary blockage, which is a life-threatening emergency. If you cannot tell whether your cat is trying to pass urine or stool, treat it as urgent and see a vet immediately. Our guide to emergency vet care in Singapore explains what to do out of hours.
Common Causes of Constipation in Cats
Constipation is usually a symptom, so it helps to know what may be behind it.
- Dehydration. Cats naturally drink little, and a mostly dry-food diet, warm weather or underlying illness can leave them under-hydrated.
- Hairballs. Grooming cats swallow hair, which can bind stool together, especially in long-haired breeds and during heavy shedding.
- Diet. Some cats do poorly with too little or the wrong kind of fibre, or after a sudden food change.
- Obesity and inactivity. Less movement can slow the gut.
- Pain or arthritis. Older cats with stiff hips or spines may find it uncomfortable to squat, so they hold on.
- Litter box problems. A dirty box, a box that is hard to climb into, a new litter type, or stress from other pets can make a cat avoid going.
- Stress. Moving house, renovation noise, visitors or a new pet can upset routines.
- Swallowed objects. String, hair ties and bits of toys can cause blockages.
- Underlying medical conditions. Kidney disease, diabetes, thyroid issues, nerve problems, pelvic injuries and certain medications can all play a part.
- Megacolon. A condition where the colon becomes enlarged and loses its ability to push stool out. It can follow repeated or long-standing constipation.
If hair seems to be a factor, our guide to cat hairballs and how to reduce them has practical grooming tips.
Safe Steps You Can Take at Home
For a cat that seems otherwise bright, eating and not in obvious distress, and has only gone a short while without passing stool, these gentle measures may help. If there is no improvement within a day or so, call your vet.
- Increase water intake. Offer fresh water in several bowls around the home. Many cats prefer wide, shallow bowls or a running water fountain.
- Add wet food. Moving some or all meals to wet food adds moisture. Make any diet change gradually.
- Encourage movement. Short play sessions with wand toys get cats moving, which helps the gut.
- Keep the litter box inviting. Scoop at least daily, use a low-entry box for older cats, and place it somewhere quiet. One box per cat plus one extra is a common guideline in multi-cat homes.
- Groom regularly. Brushing reduces swallowed hair.
- Reduce stress. Keep routines steady and give your cat quiet hiding spots during disruptions.
What not to do:
- Do not give human laxatives, stool softeners or enemas. Some are toxic to cats, and enemas can cause injury.
- Do not give oils or home remedies without your vet’s advice.
- Do not add fibre supplements or change diet drastically without checking with your vet, especially for cats with existing health conditions.
Mild Constipation vs Red Flags
| Situation | What it may mean | What to do |
|---|---|---|
| Missed one day, cat eating and playful | Possibly normal variation or mild constipation | Monitor, increase water and wet food |
| No stool for two days or more | Constipation likely | Call your vet for advice |
| Straining with little or no output, plus vomiting or not eating | Significant constipation or blockage | See a vet promptly |
| Straining to urinate, especially a male cat | Possible urinary blockage | Emergency vet immediately |
| Repeated episodes over weeks or months | Possible chronic constipation or megacolon | Book a vet assessment |
Megacolon: The Warning Signs
Megacolon develops when the colon is stretched by repeated build-ups of stool and stops contracting properly. It is more often seen in middle-aged and older cats, though any cat can be affected.
Warning signs include:
- Constipation that keeps coming back despite home measures
- Large amounts of hard stool when your cat does pass it
- Long periods of straining with little result
- Weight loss, poor coat, dehydration or vomiting
- A cat that seems generally unwell or withdrawn
If you notice a pattern, keep a simple diary of your cat’s litter box habits, appetite, water intake and weight. This helps your vet understand what is happening.
What to Expect at the Vet
Your vet will examine your cat, feel the abdomen and may recommend tests such as X-rays or blood work to find the cause. Treatment depends on severity and may include fluids for dehydration, prescribed stool softeners or laxatives safe for cats, a manual removal of stool under sedation, diet changes, or medication to help the colon move. Long-term management is common for cats with chronic constipation, and in severe megacolon your vet may discuss surgical options.
If your cat gets anxious about vet trips, carrier training can make visits calmer for both of you.
Preventing Constipation Long Term
- Feed a balanced diet that suits your cat’s age and health, with wet food in the mix if your vet agrees.
- Make water easy and appealing to drink.
- Keep your cat at a healthy weight with daily play.
- Groom regularly, especially long-haired cats.
- Keep litter boxes clean, accessible and in calm spots.
- Book regular check-ups, particularly as your cat gets older.
Spotting changes early, and acting before a mild problem becomes a serious one, is the best way to keep your cat comfortable.
Further reading: My Cat Stopped Eating: Causes and When It Becomes an Emergency