When your dog keeps trying to poo and very little happens, it is hard to know whether to give them another quiet minute or ring the vet. The useful first step is to notice what is coming out and how your dog is feeling.
Straining is a sign to take seriously. This guide explains what to record and when to ask for help. It cannot diagnose constipation or replace advice from your own vet.
Quick answer
- Contact your vet promptly if your dog is struggling to poo, repeatedly straining or crying when they try.
- Check whether they can pass urine. If they keep trying to wee but produce little or nothing, call your vet immediately.
- A swollen tummy, severe pain, repeated retching, collapse or suspected swallowed object needs immediate veterinary advice.
- Do not start laxatives, enemas or home remedies without your vet's instructions.
What can constipation look like in a dog?
Constipation means difficulty passing poo. You might notice hard, dry stools, repeated attempts with little output or discomfort when your dog crouches. Some dogs also lose interest in food or seem unusually quiet.
Those observations do not prove the cause. Straining can happen with other bowel problems too. Even a little liquid poo does not rule out constipation or a blockage, so tell the practice exactly what you have seen.
How long should I wait if my dog has not pooed?
There is no single timetable that fits every dog. Compare today with their usual routine, but do not wait for a set number of hours if they are struggling or seem unwell.
Blue Cross advises contacting a vet if a dog has gone two days without passing poo. That is not permission to wait two days while a dog repeatedly strains, cries or deteriorates. PDSA advises contacting your vet whenever your dog is struggling to poo.
Tell the practice if your dog is a puppy, elderly, already unwell, on medication or recovering from an operation. Their history helps the team judge how quickly they need to be seen.
Could they be struggling to wee instead?
It can be surprisingly difficult to tell, especially with a dog who keeps crouching. Watch from a comfortable distance and check whether urine or poo is actually being passed. You do not need to work out a diagnosis before calling.
If your dog repeatedly tries to wee but produces little or no urine, phone your vet or their out-of-hours service immediately. An inability to pass urine is an emergency. A few drops should not reassure you if the repeated straining continues.
If you cannot tell which problem you are seeing, explain that uncertainty to the practice straight away.
Which signs need immediate veterinary help?
Call immediately if your dog has a swollen tummy, especially with unsuccessful attempts to vomit. Keep them quiet while you follow the practice's directions.
Also seek immediate help for severe pain, collapse, marked weakness or difficulty breathing. These signs are not something to monitor overnight.
If your dog may have swallowed a sock, toy, bone, corn cob or another object, contact the vet straight away. Do not wait for it to appear in their poo and do not try to make them vomit yourself.
Straining alongside vomiting, blood, loss of appetite or a painful tummy also needs prompt veterinary assessment. Describe the whole picture, rather than only saying “they are constipated”.
What should I record for the vet?
A short note can make a worried phone call easier. Use this checklist, but do not delay urgent help to complete it:
- When did they last pass their usual poo, and what is their normal routine?
- How often are they trying now, and what, if anything, comes out?
- Have you seen a normal wee, a few drops or no urine?
- Is there crying, blood, vomiting, a swollen tummy or a change in appetite or energy?
- Could they have swallowed something unusual?
- What medication do they take, and have there been recent diet changes, illness or surgery?
If it is easy and safe, a brief video can help you show what you mean by straining. Ask the practice whether they want a sample and how to collect it.
What should I avoid doing at home?
Do not give human laxatives, use an enema, press on your dog's tummy or attempt to remove a suspected blockage yourself. Any treatment needs to follow the vet's assessment and instructions.
A sudden diet change or extra food is not a reliable way to solve an unexplained toileting problem. Ask before changing a veterinary feeding plan.
Keep fresh water available and give your dog a quiet opportunity to toilet while you arrange advice. Do not force drinking or make an uncomfortable dog exercise to try to produce a result.
You do not need a perfect explanation before you ring. “My dog keeps straining, and I am not sure whether they are trying to poo or wee” is useful information. Let your veterinary team guide the next step.
Reviewed: 16 October 2026
