Cat straining to poo
A cat that looks like they are straining needs a closer look before you decide what is actually happening, because straining to pass faeces and straining to urinate can look very similar from a distance, and one of those is a genuine emergency. If you are not certain which it is, or your cat is male, treat it as urgent and get them seen the same day rather than waiting to see.
Get this seen
This is worth a call to your vet rather than waiting to see how it goes, particularly if it has lasted more than a day or your pet is otherwise off-colour.
Why telling the two apart matters so much
A blocked bladder, which is far more common in male cats because of their narrower urethra, can look exactly like straining to defecate from the outside — repeated trips to the tray, crouching, visible effort, and little or nothing produced. A urinary blockage is a genuine emergency that can become life-threatening within a day or two if not treated, while simple constipation, though uncomfortable, is rarely an immediate emergency in the same way.
If you can watch closely, try to establish whether anything is being produced and from where — small, hard faeces suggest constipation, while frequent attempts producing nothing at all, or a cat crying out while in the tray, raise the possibility of a urinary problem instead. When you cannot tell, the safe assumption is the more urgent one.
Common causes of constipation in cats
Dehydration, a diet low in fibre or moisture, reduced mobility (especially in older or overweight cats), hairballs, and simply not drinking enough water are all common, everyday contributors to constipation in cats. It is a genuinely common complaint, particularly in cats fed mainly dry food or those who are less active.
Ongoing or repeated constipation is also sometimes linked to an underlying condition affecting the gut or nerves controlling it, which is part of why repeated episodes are worth investigating with a vet rather than treated as a one-off each time.
Red flags that mean same-day vet attention
Any male cat straining with little or nothing produced needs to be seen the same day — this is the classic presentation of a urinary blockage and time genuinely matters. Vomiting, lethargy, a swollen or painful abdomen, crying out, or a cat who has not produced anything at all for more than a day, regardless of sex, are all reasons to see a vet urgently rather than waiting.
Blood in the litter tray, whether in faeces or urine, straining that has gone on for more than a day even without other symptoms, or a cat who seems increasingly distressed are further reasons not to delay.
What helps with mild, occasional constipation
Encouraging more water intake — a fountain-style water bowl appeals to some cats more than a still bowl, and wet food naturally carries far more moisture than dry — can help with mild, occasional constipation once a vet has confirmed there is nothing more serious going on.
Never give a laxative, oil, or any human remedy without veterinary guidance first, since the right approach depends entirely on what is actually causing the problem, and some options that seem harmless can make certain underlying causes worse.
Why male cats are singled out here
A male cat's urethra is narrower and longer than a female's, which makes a urinary blockage from crystals, mucus or spasm considerably more likely in males and much rarer, though not impossible, in females. This is exactly why the advice above is more cautious for male cats specifically — the base rate of the more dangerous cause is genuinely higher in that group.
This does not mean a female cat straining is automatically safe to watch and wait on either — it means the threshold for urgency should already be low for any cat showing this sign, and lower still for a male cat or one who has had a urinary blockage before, since cats who have had one episode are at higher risk of another.
What can help
Things we stock that owners commonly use alongside a vet’s advice — not a substitute for it.
Plastic Cat Litter Tray — Large & XL
A sturdy plastic litter tray in two generous sizes — practical, no-fuss, and easy to clean.
From£11.49
Plastic Cat Litter Scoop
A no-nonsense plastic litter scoop for daily tray maintenance — comes in assorted colours.
£4.99
Enclosed Cat Litter Box with Carbon Filter
A roomy enclosed litter box with a carbon filter that helps keep household odours in check.
From£28.99
Whiskas 1+ Salmon Adult Dry Cat Food
Complete salmon dry food for adult cats in a practical 1.9KG bag
£12.39
Common questions
- How can I tell if my cat is straining to wee or poo?
- It can be genuinely hard to tell from the outside — both can look like repeated crouching with little produced. If you are unsure, or your cat is male, treat it as a possible urinary blockage and see a vet the same day, since that is a genuine emergency and time matters.
- Is constipation in cats an emergency?
- Ongoing constipation is uncomfortable and worth a vet visit, but it is generally less immediately dangerous than a urinary blockage, which can look similar from the outside. If you cannot be confident which one it is, treat it with the same urgency as a possible blockage.
- What causes constipation in cats?
- Common causes include dehydration, low fibre or moisture in the diet, reduced mobility, hairballs, and simply not drinking enough. Repeated episodes are worth investigating with a vet since they can sometimes point to an underlying condition.
- Can I give my cat anything at home for constipation?
- Not without veterinary guidance first. Encouraging more water intake through wet food or a fountain-style bowl can help mild cases once a vet has ruled out anything more serious, but laxatives, oils or human remedies should never be given without professional advice.
- Why is a male cat straining considered more urgent than a female?
- Male cats have a narrower urethra, which makes a urinary blockage significantly more likely in males than females. Because a blockage is a genuine emergency and can look identical to straining at defecation from the outside, any male cat showing this sign should be treated as urgent and seen the same day.
Related
Sources
Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.