Everything written about canine digestion is about diarrhoea. Constipation gets a paragraph at the end, if that.
Which is odd, because it’s genuinely common – particularly in older dogs – it’s uncomfortable, and left alone it can develop into something that needs veterinary intervention rather than a spoonful of pumpkin.
What actually counts
Most adult dogs go once or twice a day. Some go three times. What matters is what’s normal for your dog and whether it’s changed.
Constipation means passing stools less often than usual, with difficulty, or producing hard dry pellets that come out with obvious effort. On a faecal scoring chart it’s a one – dry, hard, crumbly, passed in small pieces.
The straining is the part owners notice. He postures, holds it, strains, produces very little or nothing, moves a few feet and tries again.
One important distinction before anything else. Straining to pass a stool and straining to pass urine look almost identical from a distance, and a male dog who cannot urinate is an emergency within hours. If you’re not certain which he’s trying to do, that’s a phone call rather than a wait.
Worth saying at the outset that constipation is more often a symptom than a condition. Something is causing it – dehydration, pain, medication, a physical obstruction, or a colon that has been overstretched by months of the same problem. Relieving the episode without finding the cause gets you the same episode again in a fortnight.
That’s also why the background matters as much as the immediate fix. A Dog Gut Health Supplement fed daily does nothing for a dog who is blocked up today, and it is part of the picture that keeps transit and stool quality steady over months – which is what stops the episodes happening in the first place.
Why it happens
Not enough water. The most common cause by a distance. The colon’s job is to reclaim water from what passes through, and a dehydrated dog reclaims more, leaving the stool drier.
Not enough fibre, or the wrong kind.
Too little movement. Physical activity is part of what keeps the gut moving, which is why constipation tracks with reduced exercise in older and arthritic dogs.
Pain. An arthritic dog who finds the squatting position uncomfortable will cut it short or put it off, and putting it off makes it worse.
Too much bone, in raw-fed dogs. Chalky white crumbly stools with straining is a bone ratio problem.
Swallowed material. Hair from over-grooming, bits of bone, grass, fabric, gravel.
Medication. Some painkillers, antihistamines and diuretics.
An enlarged prostate, in entire male dogs, which physically narrows the passage.
Anal gland problems or a painful bottom, which make him reluctant to go.
Change of routine. Kennels, travel, a new house, or simply nowhere he considers acceptable to use.
Obstruction, which is the serious one and needs ruling out rather than treating at home.
What to do first
Water, before anything else, and getting more in is not as simple as putting a bowl down.
The reliable method is adding it to food – switching to wet, or adding warm water to kibble and letting it stand for ten minutes. That raises total fluid intake far more dependably than hoping he drinks more.
Bowls in more than one room helps, particularly with an older dog who can’t be bothered to walk to the kitchen. Wider bowls suit dogs with whiskers or sore necks. And keep them off slippery floors, because a dog who slipped at the water bowl once will drink less afterwards.
Then fibre, introduced gradually. Psyllium husk is the most effective, roughly half a teaspoon for a small dog up to two for a large one, mixed into wet food. Plain tinned pumpkin is gentler and easier to get dogs to eat.
Psyllium without extra water makes constipation worse. It absorbs fluid to work. If you’re adding it, the water has to come with it.
Then movement. Short, frequent walks do more than one long one. Getting a dog moving after a meal genuinely helps.
Ongoing support belongs in this picture too, since the population doing the fermenting is what produces the compounds that keep the colon lining working. Daily gut support won’t relieve an episode of constipation on its own, and it’s part of why some dogs stay regular and others don’t.
What not to do
Don’t give human laxatives. Several are genuinely dangerous to dogs and the doses are wrong.
Don’t attempt an enema at home. Some human preparations contain phosphate, which can be fatal to dogs. This is a veterinary procedure.
Don’t give mineral oil or liquid paraffin without veterinary advice. If it goes into the lungs it causes a serious pneumonia, and dogs aspirate it more easily than you’d expect.
Don’t add fibre without water, as above.
Don’t ignore it for a week. A colon that stays full stretches, and a stretched colon empties less effectively, which is how a manageable problem becomes a chronic one.
When to ring the vet
Straining repeatedly with nothing produced at all, particularly if you can’t tell whether it’s urine or faeces.
Nothing passed in forty-eight hours.
Vomiting alongside it, which raises the possibility of obstruction.
Blood, obvious pain, a swollen or tense abdomen, or a dog who seems unwell.
Constipation that keeps coming back despite everything above.
Any suspicion he’s eaten something that could block – a toy, a sock, a bone, gravel.
And in an entire male dog, straining alongside difficulty urinating, which points at the prostate.
What the vet will actually do
Usually an examination including a rectal one, which tells them a great deal quickly – whether there’s a physical obstruction, an enlarged prostate, a mass, or simply impacted faeces.
X-rays if obstruction is suspected or the cause isn’t obvious.
Treatment for a straightforward case is often fluids and a veterinary-grade laxative or a properly administered enema. Impacted cases sometimes need manual removal under sedation, which is unpleasant to think about and considerably kinder than leaving it.
Then finding the cause, which is the part that stops it recurring.
The chronic version
Some dogs, particularly older ones, become repeatedly constipated. That’s worth investigating properly rather than managing with pumpkin indefinitely.
Long-standing constipation can lead to megacolon – a colon that has been stretched so often it loses the ability to contract properly. It’s much easier to prevent than to treat, and prevention means addressing the recurring cause rather than each episode.
Common underlying causes in these dogs: arthritis making the posture painful, chronic dehydration, prostate enlargement, pelvic injuries from years earlier that narrowed the canal, and neurological problems affecting the nerves to the colon.
Pain relief for an arthritic dog frequently improves the constipation as a side effect nobody predicted, which is worth raising if your older dog is both stiff and struggling.
The dogs most likely to get it
Worth knowing whether yours is a candidate, because prevention is considerably easier than treatment.
Older dogs, for several reasons at once: reduced thirst drive, less activity, arthritis making the posture uncomfortable, and slower gut motility.
Arthritic dogs of any age. The link is mechanical and it’s routinely missed.
Entire male dogs, because prostate enlargement is extremely common with age and narrows the passage physically.
Long-coated breeds and heavy shedders, who swallow hair while grooming.
Raw-fed dogs, if the bone ratio is off.
Dogs recovering from surgery, particularly orthopaedic surgery, where pain and reduced movement combine.
Dogs on certain medications, including some painkillers and antihistamines.
Fussy toileters. More common than people think – dogs who won’t go on wet grass, or gravel, or anywhere unfamiliar. A dog holding on for two days because he doesn’t like the new garden is a real thing.
The travel and kennels version
Predictable enough that it’s worth planning for.
Plenty of dogs won’t toilet properly away from home. Between the unfamiliar surface, the strange routine and the general stress, they hold on – sometimes for a day or two, which is uncomfortable and sets up a harder problem afterwards.
If you’re boarding him, mention it. A good kennel will make sure he gets enough opportunity and enough time, rather than a brisk five minutes on concrete.
On holiday or in the car, stop more often than you think necessary and give him a proper ten minutes somewhere quiet on grass rather than a rushed two minutes at a service station.
And add water to his food while you’re away, since travel and reduced drinking go together.
Prevention
Keep water intake up, mostly through food.
Keep a sensible amount of fibre in the diet, from the food rather than added daily.
Keep him moving, even when he’s old – short and frequent beats long and occasional.
Treat arthritis properly rather than accepting stiffness as age.
Groom heavy-coated dogs regularly, because swallowed hair contributes.
Watch bone content in raw diets.
Give him somewhere acceptable to go. Some dogs are particular, and a dog who won’t use a wet lawn or a gravel surface will hold on until it becomes a problem.
And keep an eye on it. It’s the same habit that catches everything else – you’re already looking, so notice what you’re seeing, and act on a pattern rather than waiting for a crisis.
