Caninelifeco Dogs Blog
Dog Constipation: Signs, Causes and What Actually Helps
Aug
You know your dog’s routine better than you’d care to admit. Same lamppost, same patch of grass, same slightly embarrassing pause while you stand there with a bag in your hand pretending to look at your phone.
So when that routine stops — when they circle, hunch, hold the position for far too long and produce nothing — it’s obvious something’s wrong. The instinct is to fix it fast. A spoonful of something, a splash of olive oil, whatever the internet suggests.
Here’s the problem with that instinct: constipation isn’t a diagnosis. It’s a symptom, and it has a dozen different causes. Some resolve with a longer walk and a bowl of fresh water. A couple of them are surgical emergencies. And a few of the “quick fixes” doing the rounds online have genuinely killed dogs.
This guide will help you work out which situation you’re in.
What counts as constipation in a dog?
Constipation means your dog is passing stools less often than normal, or straining to pass them, or both. The stool that does come out is usually dry, hard and formed into small compacted pellets, because the longer it sits in the colon the more water gets absorbed out of it.
What’s normal? Most healthy adult dogs go once to three times a day. Puppies go more — often after every meal. But the honest answer is that “normal” is whatever your dog usually does. A dog who reliably goes twice a day and has now gone thirty-six hours is more concerning than a dog who has always been a once-a-day sort.
It’s also worth knowing that less poo isn’t always constipation. If you’ve switched to a higher-quality, more digestible food, there’s simply less waste coming out the other end. If it’s hot and they’re eating less, there’s less to pass. The test is quality, not quantity: a smaller-than-usual stool that comes out easily and looks moist is fine. A stool that takes three minutes of effort and lands like a pebble is not.
First: is it actually constipation?
This is the bit most articles skip, and it’s the bit that matters most. A dog straining in the garden is not automatically a constipated dog — and two of the lookalikes are emergencies.
It might be diarrhoea
This sounds backwards, but inflammation of the large intestine (colitis) causes an urgent, painful, repeated urge to go. Your dog strains over and over, producing nothing or a small amount of mucus or jelly-like liquid, sometimes streaked with fresh blood. Owners frequently describe this as “constipated” because all they can see is straining.
The tell: constipation produces hard and dry, or nothing at all. Colitis produces small amounts of soft, slimy or bloody material, and your dog seems desperate to go rather than reluctant. If you’re seeing loose stools alongside the straining, read our guide to soft poo in dogs instead.
It might be a urinary blockage — this is an emergency
A dog straining to urinate looks almost identical to a dog straining to defecate. Both crouch, both hold the posture, both look uncomfortable. But a male dog who cannot pass urine is in a genuine, life-threatening emergency, and the window is hours, not days.
Watch which end. If you can, get low and look. Are they producing any urine at all — even a dribble? Is the belly tense and swollen? Are they crying out, restless, unable to settle? If there’s any doubt, ring your vet immediately. This one isn’t worth waiting on.
It might be their anal glands
Full, impacted or infected anal glands make the act of passing a stool painful, so dogs start to avoid it — which then genuinely does cause a backlog. You’ll often see scooting along the carpet, excessive licking under the tail, or a strong fishy smell.
We’ve covered this in detail in Why Is My Dog Scooting? and Dog’s Anal Glands: Common Problems & Treatment.
It might be the prostate
In older, unneutered male dogs, an enlarged prostate presses on the rectum and physically narrows the passage. The classic sign is stools that come out flattened or ribbon-like rather than round. Worth mentioning to your vet, because it’s easily checked and very treatable.
Signs of constipation in dogs
Assuming you’ve ruled out the lookalikes above, here’s what genuine constipation looks like:
Changes in the routine
- Going less often than usual, or skipping their reliable morning poo
- Nothing produced on a full walk when they’d normally go
Effort and posture
- Adopting the position repeatedly without result
- Taking far longer than usual to produce a small amount
- Circling, shuffling forward mid-squat, or giving up and walking off
The stool itself
- Small, hard, dry pellets — sometimes described as “like gravel”
- Very dark and compacted
- Flattened or ribbon-shaped
- Streaks of fresh blood on the outside from straining
- A small amount of brown liquid seeping past a blockage (this is not diarrhoea getting better — it’s liquid finding its way around an impaction, and it needs a vet)
In your dog generally
- Reduced appetite
- Reluctance to lie down comfortably, or restlessness
- A tense, tucked-up abdomen
- Low mood or reluctance on walks
When to call the vet straight away
Don’t wait out the 24 hours if you see any of these:
- Repeated straining with absolutely nothing produced
- Vomiting — especially combined with a lack of stool, which can indicate an obstruction
- A hard, distended or painful belly
- Lethargy, hiding, or refusing food and water
- Any suspicion they’ve swallowed something — a sock, a toy, a corn cob, a stone, a large piece of bone
- A puppy who hasn’t passed anything in 12 hours, or who is off their food
- A senior dog or one with an existing health condition
- Any doubt at all about whether they’re passing urine
Otherwise, the working rule is this: if your dog is bright, eating and comfortable, you have roughly 24 hours to try the simple measures below. If there’s still nothing after that, book in.
What causes constipation in dogs?
It helps to think about this in five groups, because the group tells you how urgent it is.
1. Something physically in the way
The most serious category. Swallowed objects, compacted bone fragments, matted fur around the back end (very common in long-coated breeds and often missed), or large amounts of grass, sand or hair in the stool. Bone is a particular culprit — cooked or raw, it compacts into a chalky, cement-like mass that’s genuinely difficult to pass. Our guide to chews and safety is worth a read if bones are part of your dog’s routine.
2. Not enough water
Underrated, and probably the single most common driver. The colon’s job is to reclaim water from waste. If your dog is even mildly dehydrated, it reclaims more, and the stool dries out. That makes it harder to pass, which means it sits longer, which means more water is absorbed — a loop that tightens on itself.
Hot weather, a switch from wet to dry food, a dog who won’t drink from an unfamiliar bowl on holiday, or an illness causing fluid loss can all start it. See How Much Water Does Your Dog Need? and Dehydration in Dogs.
3. Something painful
This one is badly under-recognised, and it matters enormously for older dogs.
Passing a stool requires a squat. It’s a sustained, load-bearing position that puts real demand on the hips, stifles and lower spine. A dog with arthritic hips or a sore back will find that position uncomfortable — so they cut it short, or avoid it, or don’t fully empty. Do that for a few days and you have a constipated dog whose actual problem is joint pain.
The clue is often elsewhere: stiffness getting up in the morning, reluctance on stairs, a shortened stride on the first few minutes of a walk. If any of that sounds familiar, How Do I Know if My Dog Is in Pain? and Arthritis in Dogs are the next reads.
Anal gland pain, perianal wounds and post-surgical discomfort work the same way.
4. Not enough movement
Physical activity stimulates the gut. A dog on crate rest, recovering from surgery, or simply walking less through a wet fortnight in February will often slow down at both ends.
5. Something systemic — or something in the medicine cabinet
Underlying illness can affect gut motility and hydration: kidney disease, diabetes, an underactive thyroid, or electrolyte imbalances. Spinal and neurological problems can affect the nerves that control the colon.
Several common medications also slow things down — opioid painkillers, some antihistamines, diuretics, certain antacids and iron supplements among them. If your dog started a new medication recently and became constipated shortly after, mention it. Don’t stop the medication yourself.
What to do in the first 24 hours
If your dog is bright, eating and comfortable, and you’ve ruled out the red flags above, these are the safe things to try.
Get water into them. This is the priority, and it’s more effective than anything else on this list.
- Add warm water to their normal food and let it soak — a couple of tablespoons for a small dog, up to half a cup for a large one
- Offer a second water bowl in a different room, or a pet water fountain (some dogs drink far more from moving water)
- A splash of low-sodium, onion-free bone broth or the water from a tin of plain tuna can tempt a reluctant drinker
- Not milk — most adult dogs don’t digest lactose well and you’ll add an upset stomach to your list of problems
- Not gravy or stock cubes — far too salty, and they’ll make dehydration worse
Get them moving. Two or three short, gentle walks beat one long forced march, especially for an older or uncomfortable dog. Sniffing, pottering and gentle movement stimulate the gut without demanding much of sore joints.
Give them privacy and good footing. Sounds trivial; isn’t. Some dogs won’t go on wet grass, on a lead, in an unfamiliar garden, or with someone watching them. Slippery decking or a steep step down to the garden can put an arthritic dog off entirely.
Check under the tail. Gently. Matted fur, dried faeces stuck to the coat, or visible swelling around the anus can be the whole explanation. If there’s matting, don’t cut it out with scissors — the skin beneath is thinner than you think. Book a groomer or vet.
Hold the diet changes. Resist the urge to suddenly switch food or pile in the fibre mid-episode. It’s counter-intuitive, but adding bulk to a colon that’s already struggling to shift what’s in it can make matters worse. Fibre is for prevention, not for rescue.
What not to do
Some of the advice circulating online ranges from useless to genuinely dangerous. Please don’t:
Give a human enema. This is the important one. Sodium phosphate enemas — Fleet and its supermarket equivalents — are sold over the counter for people and are potentially fatal in dogs. They cause a rapid, severe shift in blood sodium, phosphate and calcium. Small dogs are at highest risk, but fatalities have been recorded across sizes. There is a version of this treatment that’s safe, and it involves a vet choosing the product, the volume and the aftercare. There isn’t a home version.
Give human laxatives. Senna, bisacodyl, docusate, magnesium salts — doses and safety margins are completely different in dogs, and several interact badly with existing conditions and medications. Lactulose is commonly and safely prescribed by vets for dogs, but at a dose calculated for your dog, and only once an obstruction has been ruled out. Giving a laxative to a dog with a physical blockage can cause serious damage.
Give mineral oil or liquid paraffin by mouth. It’s tasteless, which means dogs inhale it without triggering a cough reflex, and it causes a severe and often fatal pneumonia. This one still gets recommended in old forum threads. Ignore them.
Give olive oil, butter or “a bit of fat” to grease things up. At best, ineffective. At worst, a high-fat hit that risks triggering pancreatitis.
Try to manually help. Whatever you’ve seen, don’t.
What the vet will actually do
Knowing what to expect takes some of the anxiety out of the call.
Your vet will start with a hands-on examination — feeling the abdomen for a firm column of stool, and usually a rectal examination to check for narrowing, masses, prostate enlargement or anal gland problems. That exam alone often gives the answer.
Depending on findings, they may recommend an X-ray or ultrasound to see how much has built up and whether anything is obstructing, plus blood tests to check hydration, kidney function, electrolytes and thyroid.
Treatment then follows the cause. Mild cases: fluids under the skin or intravenously, plus a prescribed stool softener. More established cases: a properly chosen enema, and in stubborn ones a general anaesthetic so the colon can be emptied safely and without pain. Obstructions may need surgery. And anything underlying — arthritis, prostate disease, thyroid, anal glands — gets treated in its own right, because otherwise you’ll be back in a fortnight.
Worth bringing with you: a photo of the last stool they passed, a rough note of when it happened, a list of any medications or supplements, and details of anything they might have chewed or swallowed.
Keeping it from happening again
Once your dog is comfortable and back to normal, this is where the real work is. Recurrent constipation is nearly always a management problem.
Water first
Every prevention strategy starts here. Multiple bowls, changed daily. A splash of water in every meal. A fountain if your dog is a fussy drinker. If you feed dry food exclusively, adding moisture at mealtimes is the easiest single change most owners can make.
The right kind of fibre — in the right amount
Fibre helps, but “more fibre” is too blunt an instruction, because the two types do different jobs:
- Soluble fibre (psyllium husk, oat bran, cooked pumpkin) absorbs water and forms a gel that softens and lubricates the stool. This is usually what a constipated dog needs.
- Insoluble fibre (bran, vegetable skins, cellulose) adds bulk and speeds transit. Useful in the right context, unhelpful if the stool is already dry and hard.
Introduce any fibre gradually over a week or two, alongside increased water — fibre without water makes constipation worse, which is exactly how well-meaning owners end up back at the vet. Plain cooked pumpkin (not the spiced pie filling) is the classic starting point, and a teaspoon to a tablespoon depending on size is plenty.
Our full guide: The Benefits of Fibre for Dogs.
Look after the gut itself
The bacterial population in your dog’s gut influences motility, water handling and stool consistency. It takes a knock from antibiotics, dietary changes, stress and illness — all of which are common precursors to a constipation episode.
Our Enhanced Dog Probiotics is a natural, UK-manufactured powder that scoops straight onto food, designed to support a stable gut population and consistent digestion. It’s a sensible long-term addition for dogs who are prone to swinging between too loose and too firm. There’s more on why this matters in The Importance of a Healthy Microbiome for Dogs.
Keep them moving, and keep the squat comfortable
Regular daily exercise is one of the most reliable regulators of bowel habit there is. But for older dogs, this is also where joint comfort and digestive health quietly overlap — a dog who can hold a proper squatting position without pain will empty properly, and a dog who can’t, won’t.
If your dog is eight or over, or showing early stiffness, our Senior Dog Joint Supplement range combines glucosamine, chondroitin, turmeric and omega-3 to support comfortable movement. For dogs from two years, the Enhanced Adult Joint Supplement does the same job preventatively. It’s an indirect route to better digestion, but for a lot of older dogs it’s the one that actually solves the problem.
Manage the obvious risks
- Keep bones, rawhide and swallowable toys out of reach of enthusiastic chewers
- Keep the coat around the back end trimmed short on long-haired breeds
- Stay on top of worming
- Get anal glands checked if your dog has a history of trouble — see How Often Should a Dog’s Anal Glands Be Expressed?
- Make dietary changes gradually, over 7–10 days
Special cases
Puppies
The same condition, but a much shorter fuse. Puppies eat frequently, grow fast and have very little reserve. A puppy who stops eating because they’re uncomfortable can deteriorate within hours.
In a young puppy, 12 hours without a stool warrants a phone call. If they’re also off their food, whining, or their tummy looks bloated, go now. Puppies also swallow things, and a small intestine plus a swallowed toy is a surgical problem, not a dietary one.
Senior dogs
Older dogs are constipated more often, for more reasons at once: less exercise, weaker abdominal muscles, arthritis making the position painful, reduced thirst drive, more medications, and a higher background rate of prostate and thyroid disease.
They also deserve less benefit of the doubt. If your senior dog is constipated and it’s not obviously explained by a hot week or a missed walk, get them checked rather than managing it at home repeatedly — constipation is a symptom that can point at something worth catching early. Our Complete Guide to Senior Dog Health covers what else to watch for.
Small and toy breeds
Worth knowing that toy breeds are disproportionately affected by the phosphate enema toxicity described earlier, and are also more likely to have swallowed something they shouldn’t relative to their size. Small dog, small intestine.
Frequently asked questions
How long can a dog go without pooing before it’s serious? Most healthy adult dogs go once to three times daily. If a bright, comfortable, eating dog hasn’t passed anything in 24 hours, try more water and gentle exercise. Beyond 48 hours, or at any point if they’re vomiting, lethargic, straining without result or have a painful abdomen, see a vet. For puppies the threshold is much shorter — around 12 hours.
Can I give my dog pumpkin for constipation? Plain cooked or tinned pumpkin (not pie filling) is a reasonable source of soluble fibre and is safe in small amounts — roughly a teaspoon for a small dog, up to a tablespoon for a large one. It works best as a preventative alongside increased water intake, rather than as an emergency fix mid-episode. Add fibre gradually, never suddenly.
Can I give my dog olive oil for constipation? It’s a popular suggestion but not a good one. It rarely helps, and a sudden fatty load can trigger pancreatitis in susceptible dogs. Water and gentle exercise are safer and more effective. Never give mineral oil or liquid paraffin by mouth — it can be inhaled and cause fatal pneumonia.
Can I use a human laxative or enema on my dog? No. Over-the-counter sodium phosphate enemas can be fatal in dogs, particularly small breeds, and human oral laxatives have very different dose and safety profiles. Some medications used in dogs — lactulose, for instance — are prescribed by vets at doses calculated for your dog, and only after an obstruction has been ruled out.
Why is my dog straining but nothing is coming out? Repeated straining with no result needs a vet the same day. It can mean an obstruction, but it can also mean colitis or — in male dogs especially — a urinary blockage, which is a genuine emergency. Check whether they’re passing any urine at all, and ring your vet.
Can arthritis cause constipation in dogs? Yes, indirectly and more often than most owners realise. Squatting is a demanding position for painful hips, stifles or spine, so uncomfortable dogs cut it short, avoid it, or don’t fully empty. Managing joint comfort frequently resolves recurrent constipation in older dogs.
My dog is constipated and vomiting — what does that mean? Treat it as urgent. The combination often points to a blockage in the digestive tract, which can be an object they’ve swallowed, compacted bone or a mass. Don’t wait it out and don’t give anything by mouth. Ring your vet now.
The short version
Constipation is a symptom with a wide range of causes. Most cases in otherwise healthy dogs are down to hydration, movement or comfort, and resolve within a day with water and gentle exercise. But it’s worth checking you’re actually looking at constipation and not a lookalike — and it’s absolutely worth resisting the home remedies that do more harm than good.
If your dog is bright, eating and comfortable, you have a day to try the simple things. If they’re not, don’t wait.
The information in this article is for general guidance only and is not a substitute for professional veterinary advice. If you’re concerned about your dog’s health, please contact your vet.
