How do I know if my pet is constipated?

Common signs include fewer bowel movements, hard and dry stools, straining or crying out during defecation, vomiting, and changes in energy and appetite. If there is no improvement after 24–48 hours, a vet visit is recommended.

When is constipation considered obstipation?

Obstipation generally refers to cases that do not improve with basic management, where straining is severe and recurrent, or where underlying bowel dysfunction is suspected — requiring further imaging or specialist evaluation and ongoing monitoring.

What tests will the vet run to find the cause?

The vet will typically combine a physical examination with abdominal X-rays and a blood chemistry panel, and may arrange advanced imaging (such as a CT scan) or endoscopic sampling to confirm the cause.

What information can owners prepare before the appointment?

Record the time symptoms started, frequency of vomiting and defecation episodes, and changes in appetite and water intake. Video clips of defecation attempts or the abdomen are also helpful, as is a fresh stool sample for testing.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Constipation & Obstipation in Dogs and Cats: Symptoms, Diagnosis & Home Care [2025]

Constipation and obstipation are common in senior cats and require identifying the underlying cause. Mild cases can be managed with medication and dietary adjustments; severe cases may require surgery.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: WSAVA, ISFM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Persistent severe vomiting with complete inability to defecate
•Obvious abdominal distension with intense pain on palpation
•Extreme lethargy or inability to stand and move independently

Schedule a Clinic Visit Soon (within 24–72 hours)

•Significantly reduced frequency of bowel movements or prolonged absence of defecation
•Visible straining during defecation or crying out in pain while trying
•Decreased appetite along with a noticeable reduction in water intake

01What symptoms indicate a problem?

Constipation and obstipation in dogs and cats most commonly present as changes in defecation patterns and general behavioural withdrawal, sometimes accompanied by digestive or systemic signs.

Lethargy and noticeably reduced activity — note when the change began
Repeated or persistent vomiting — note the frequency and timing
Signs of pain or obvious discomfort when the abdomen is touched or during defecation
Tenesmus or difficulty defecating — straining or crying out during attempts
Hard, dry stools or prolonged absence of bowel movements — medical evaluation is advised

Seek emergency care immediately if you notice the following symptoms:

⚠️ Persistent inability to defecate combined with frequent vomiting
⚠️ Obvious abdominal distension or severe pain on palpation
⚠️ Extreme lethargy or inability to stand unassisted

02How do I assess the situation at home? Key observations and criteria for seeking emergency care

Observing and recording specific details at home helps the vet quickly understand the timeline and likely cause.

Record when symptoms started, how often they occur, and how long they last
Note the number of vomiting episodes, timing, and nature of the vomit
Track changes in appetite and water intake daily
Monitor bowel movement frequency, stool consistency, and ease of passage
Capture video of the abdomen or defecation attempts to share with the vet at the appointment

03How will the vet diagnose this? Common diagnostic tests

On arrival, the vet will typically perform a physical exam alongside imaging and blood tests to identify faecal impaction or other underlying causes.

Physical examination

abdominal palpation to assess faecal accumulation, hardness, and tenderness

X-ray

to evaluate the amount, shape, and location of faecal material and any obstruction

Blood and biochemistry panel

to assess hydration status and organ function

Advanced imaging (CT scan)

for complex or ambiguous cases requiring further evaluation

Endoscopy or biopsy

tissue sampling when needed to clarify underlying pathology

04How is this treated and managed after diagnosis? Medications, dietary adjustments, and home care

After treatment, ongoing dietary management, medications, and follow-up testing are needed, along with monitoring for symptom recurrence or complications.

Adjust diet as advised by the vet to improve stool consistency and bowel function
Use veterinarian-prescribed prokinetics or stool softeners as directed
Attend scheduled follow-up visits to monitor defecation and repeat blood tests as needed
Home care focuses on maintaining hydration and observing bowel movements as instructed by the vet
If symptoms return or worsen, arrange specialist imaging or a clinic visit promptly

05What should I prepare before seeing the vet? Keys to helping the vet identify the cause quickly

Compile a symptom log and timeline of onset, including frequency and duration

Prepare a record of vomiting and defecation over recent days, including any video clips

List all medications and supplements along with the time of the last dose given

If possible, bring a small fresh stool sample for laboratory testing

Book a clinic that can perform X-rays or advanced imaging, and bring any prior scan footage

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.