Cat Constipation: Signs, Home Care and Red Flags

Constipation is uncomfortable for cats and worrying for owners, especially as the straining can look alarmingly like a urinary problem — which is a genuine emergency. Knowing the difference, and what helps, makes all the difference. This is general guidance, not a substitute for veterinary advice — if you're worried, contact your vet.

What is constipation in cats?

A constipated cat passes faeces less often than normal, or strains to pass hard, dry stools. Most cats poo around once a day, so going much less frequently, or producing small, hard, pellet-like stools, can signal constipation. It's the kind of thing that's easy to miss if your cat toilets outdoors, which is one reason a sudden change in litter-tray habits is worth noticing.

Left unaddressed, mild constipation can progress to a more serious, severely blocked-up state where the bowel becomes stretched and the cat genuinely struggles to pass anything at all. Catching and helping it early is much kinder and simpler than dealing with that, so it's worth acting promptly rather than hoping it sorts itself out.

Common causes

• Dehydration — one of the biggest factors; see cat hydration
• Hairballs and swallowed fur (hairballs in cats)
• Low-fibre diet or a sudden food change
• Pain or reluctance to use a dirty, cramped or stressful litter tray
• Older age, reduced activity, or underlying conditions such as kidney disease

Signs your cat is constipated

Watch for:

• Straining in the tray, often with little or nothing produced
• Small, hard, dry stools — sometimes with a streak of blood
• More frequent, unproductive trips to the tray
• Reduced appetite (cat not eating), lethargy or a tense tummy
• Crying or obvious discomfort when toileting

Important: straining with nothing produced can also mean a blocked bladder — a life-threatening emergency, especially in male cats. The two can look almost identical from across the room. A cat squatting and straining in the tray might be constipated, or might be unable to pass urine, and the second is an emergency that worsens by the hour. If you're not certain it's the bowels, treat it as urgent and ring your vet — see our guide on cat UTI symptoms for the warning signs.

Gentle home care

For mild, occasional constipation in an otherwise well cat, you can:

• Boost water intake — wet food, a water fountain, and several bowls around the home
• Keep litter trays spotless and in quiet, accessible spots (one per cat, plus one spare)
• Encourage gentle activity and play — see indoor cat enrichment
• Keep up grooming to reduce swallowed hair

Don't give laxatives, oils or human remedies without veterinary advice — some are harmful, and the wrong approach can make things worse. Check any dietary change is suitable with our can my pet eat this checker. You'll find water fountains and litter trays in the shop.

The litter tray itself is worth a second look, because cats are particular creatures. A tray that's too small, in a busy or exposed spot, shared with another cat, or not cleaned often enough can make a cat hold on rather than go — and holding on lets stools dry out and harden. The general guidance of one tray per cat plus a spare, kept clean and somewhere quiet, isn't fussiness; it genuinely helps prevent the kind of reluctance that tips a cat into constipation in the first place.

When to see a vet

Contact your vet if your cat:

• Has been straining without producing anything — rule out a urinary blockage urgently
• Hasn't passed faeces in more than 48 hours, or is clearly distressed
• Is off food, lethargic, vomiting, or has a tense, painful tummy
• Has repeated constipation — this needs investigating for an underlying cause
• Passes blood, or you can feel a hard, full tummy

Recurrent or severe constipation needs proper veterinary management, so don't leave it — a one-off bout that resolves is one thing, but a cat who keeps getting bunged up may have an underlying issue, from inadequate hydration to a medical condition, that's worth getting to the bottom of. The kindest approach is to support the easy cases gently at home while keeping a low threshold for picking up the phone, particularly when you can't be sure whether your cat is straining to poo or to wee. You can find a vet near you in our directory.

Sources

• PDSA — Constipation in cats: https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub
• International Cat Care — Cat advice: https://icatcare.org/advice/
• Blue Cross — Cat advice: https://www.bluecross.org.uk/advice/cat