Constipation in Dogs: Causes, Symptoms, and the Dietary Fix
At a glance
- Constipation in dogs is defined as passing fewer than one stool per day, or straining to go with little or no result.
- The most common causes are low-fibre diet, dehydration, and insufficient exercise.
- Most cases resolve within 24 to 48 hours when fibre intake and hydration are increased.
- Dogs that haven't passed a stool in more than 48 hours, or that are vomiting alongside constipation, need veterinary attention.
- Diet is both the most common cause and the most effective fix.
What does constipation in dogs actually look like?
Constipation in dogs means the bowel isn't moving waste through at a normal pace. A healthy dog passes at least one firm-but-not-hard stool per day. A constipated dog either produces nothing, strains repeatedly without success, or produces small, dry, pebble-like stools that clearly require effort.
The signs to watch for include circling repeatedly before attempting to go, crouching for an unusually long time, whimpering during the attempt, and producing stools that are noticeably harder or drier than usual. Some dogs also become lethargic, lose interest in food, or show mild abdominal discomfort when pressed gently around the belly.
Occasional constipation — once every few months — is not a cause for alarm in most dogs. Repeated episodes, or any single episode lasting beyond 48 hours, point to something that needs addressing, whether dietary, lifestyle-related, or medical. Diet and your dog's health are more closely connected than most owners realise, and common digestive conditions including constipation are frequently rooted in what goes into the bowl.
What causes constipation in dogs?
Low dietary fibre is the single biggest driver of constipation in dogs. Fibre absorbs water in the gut and adds bulk to stools, which helps the intestine move waste along efficiently. Without enough fibre, stools become dry and compact, and the gut slows down.
Dehydration compounds the problem. When a dog isn't drinking enough, the large intestine pulls extra water from the waste passing through it. That makes stools even harder and more difficult to pass. Dogs fed primarily on dry kibble are particularly prone to this because kibble contains as little as 10% moisture, compared to 70 to 80% in fresh food.
Other common causes include:
- Ingesting something that doesn't pass easily — grass, bone fragments, hair, or non-food items
- Reduced exercise, which slows gut motility
- Stress or a significant change in routine
- Certain medications, including some pain relief and antihistamines
- Enlarged prostate in unneutered male dogs
- Underlying conditions such as hypothyroidism or neurological issues
If constipation is frequent or worsening despite dietary improvements, a vet should rule out an underlying medical cause. That is the one situation where home management isn't enough.
What dietary changes actually fix constipation in dogs?
Increasing fibre and moisture in the diet is the most effective dietary intervention for constipation in dogs. These two changes address the root cause directly, and most dogs respond within one to two days.
On the fibre side, soluble fibre is the most useful type here. It draws water into the stool and softens it, making it easier to pass. Good sources include cooked pumpkin or butternut squash (plain, no seasoning), cooked sweet potato, and chicory root. Chicory root is one of the most well-researched prebiotics in dog nutrition — it feeds the beneficial bacteria that keep digestion stable and supports regular bowel movements at the same time.
Marleybones meals include chicory root alongside linseeds and chia seeds, both of which provide soluble fibre that supports gut motility. The Pantry Fresh format also delivers 70 to 80% moisture in every meal, which directly addresses the dehydration issue that dry food diets often create.
On the hydration side, switching from dry food to a high-moisture diet is more effective than simply encouraging a dog to drink more water. Dogs don't naturally compensate for dry food by drinking significantly more. A diet with adequate moisture built in removes the problem at source.
Adding a small amount of plain, unsweetened canned pumpkin — roughly one to two teaspoons for small dogs, one to two tablespoons for larger breeds — to existing meals is a practical short-term fix. Olive oil, in small amounts, can also help lubricate the gut temporarily. Neither replaces a longer-term dietary adjustment if constipation is recurring.
Every dog is different — build your personalised Marleybones feeding and health plan tailored to your dog's age, size, and health requirements.
How do you compare dietary approaches for a constipated dog?
| Diet type | Moisture content | Fibre level | Constipation risk |
|---|---|---|---|
| Dry kibble | ~10% | Variable, often low soluble fibre | Higher — low moisture worsens dry stools |
| Wet/tinned food | ~75-80% | Variable | Lower than kibble if fibre is adequate |
| Raw food | ~60-70% | Low unless vegetables added | Can be higher, especially with bone content |
| Fresh complete meals | ~70-80% | Higher if superfoods included | Lower — moisture and fibre work together |
The table above shows why diet format matters as much as diet content. A food can list fibre on the label and still be inadequate if the moisture level is too low for the gut to use it effectively. Fibre needs water to do its job.
Marleybones Lush Lamb is a good example of a meal that brings both elements together — a high moisture fresh format with linseeds and chicory root included as standard, not as optional extras.
“Such a relief to see her enjoying her food”
FAQs
How long can a dog go without pooing before it becomes a problem?
Most dogs pass at least one stool per day. Going 24 hours without a bowel movement is worth monitoring. Going 48 hours without one, or straining repeatedly with nothing produced, warrants a call to your vet.
Can I give my dog laxatives for constipation?
Human laxatives are not safe for dogs. Some vet-prescribed options exist for dogs, but dietary adjustment — increasing fibre and moisture — resolves most cases without medication. Always speak to a vet before giving any laxative product to a dog.
Is constipation more common in older dogs?
Yes. Older dogs are more prone to constipation because gut motility slows with age, exercise levels tend to reduce, and some are on medications that affect bowel function. Keeping hydration and dietary fibre consistent becomes more important as dogs age.
Can too much bone in a dog's diet cause constipation?
Yes. Bone is a well-established cause of constipation in dogs. It produces dry, white, crumbly stools that are hard to pass and can compact in the colon. Dogs on raw diets with high bone content are particularly at risk.
Does stress cause constipation in dogs?
Stress disrupts normal gut function in dogs, just as it does in humans. A change of environment, a new pet in the home, or a disrupted routine can all temporarily slow the bowel. The effect is usually short-lived, but if it coincides with a low-fibre diet, the combination can cause noticeable constipation.
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