Causes of constipation in dogs

There can be many underlying causes of constipation in dogs and your vet is best placed to get to the root cause. Some common causes include:

Diet

A lack of fibre in the diet is a common cause of constipation as is eating something unusual. Both issues change the texture of the poo making it harder to pass.

Age

Older dogs are more likely to suffer from constipation but it can affect dogs of any age.

Dehydration

If your pet is dehydrated the body will try and reabsorb as much water as it can from the bowels which causes the poo to become drier and firmer leading to constipation.

Matted hair

Matted hair around the back end especially with the Poodle-type coats and longer-haired breeds can cause constipation.

Lack of mobility or pain

If your dog finds it difficult or uncomfortable to crouch down due to arthritis injury or surgery they may struggle to pass a poo and become constipated.

Medications

Some medications can cause constipation including antihistamines, opiates, diuretics and cancer medications.

Stress

Constipation can be a result of a dog choosing not to poo due to stressful situations
fear or anxiety.

Anal gland issues

Blocked or impacted anal glands can cause constipation in dogs. Often a dog with anal gland issues will drag their rear end along the ground excessively lick the area or it may appear red and swollen.

Prostate enlargement

Dogs with enlarged prostates can struggle to pass stool and therefore experience constipation.

Medical issues

Metabolic conditions such as renal issues (kidneys) or hypothyroidism often cause constipation
as can an injury to the spine or pelvic area.

Tumours

A tumour in the digestive tract or pelvic region can cause narrowing obstructing the path of faeces.

Exercise

Less active dogs typically have a slower digestive system and are more likely to experience constipation. You can read more about exercise and dogs here.

Being overweight

Excess fat can make it harder for your pet to pass a poo.

Dog constipation guide.