What is acquired portosystemic shunt?

Acquired portosystemic shunt refers to abnormal portal blood flow that bypasses the liver, potentially causing neurological or gastrointestinal symptoms. It requires imaging and laboratory tests to assess, and the vet will determine the appropriate management based on the results.

What symptoms should prompt a vet visit?

If your pet has persistent vomiting, loss of appetite, decreased activity, or abnormal thirst or urination, it is advisable to seek veterinary care promptly for blood and imaging tests to rule out portosystemic shunt or other liver and kidney problems.

What tests are typically needed for diagnosis?

Common tests include a complete blood count and biochemistry panel, urinalysis, and abdominal imaging (ultrasound or CT scan). A biopsy or specialist assessment may also be required in some cases to clarify the underlying cause.

How often is follow-up needed after surgery or treatment?

Both post-surgical and conservative treatment require regular follow-up with blood tests and imaging. Initially, check-ups may be scheduled every few weeks to months; the long-term frequency will be adjusted based on your pet's condition. Follow your vet's instructions.

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

Acquired Portosystemic Shunt in Dogs & Cats: Symptoms, Diagnosis & Post-op Care [2025]

Abnormal acquired portosystemic shunting causing hepatic encephalopathy

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: ACVIM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Persistent seizures or loss of consciousness
•Severe inability to eat or repeated heavy vomiting
•Marked lethargy to the point of being difficult to rouse, or coma

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

•Reduced appetite lasting more than two days without clear improvement
•Recurring vomiting or diarrhea with otherwise normal alertness
•Significantly increased water intake or urination frequency

01What symptoms suggest something is wrong?

Symptoms associated with acquired portosystemic shunt are typically systemic or gastrointestinal. Clinical presentation can vary in severity and requires multiple tests to confirm.

Changes in mental status, such as lethargy, dullness, or decreased activity
Loss of appetite or a significant reduction in food intake
Repeated or increasingly frequent vomiting
Diarrhoea or changes in stool colour or consistency
Noticeably increased water intake or more frequent urination
If symptoms persist or worsen, seek veterinary evaluation promptly

02How can I monitor at home? Key observation points and when to seek urgent care

Observing and recording key information at home helps your vet quickly understand the progression and arrange appropriate tests.

Note changes in alertness and when they occur (e.g. periods of drowsiness or poor responsiveness)
Record actual food intake each day and whether your pet is eating voluntarily
Log each vomiting episode — frequency, timing, and what was brought up
Monitor and record bowel movement frequency, stool consistency, and colour changes
Estimate and log daily water intake and urination frequency
Bring the diary or video footage to the clinic to help your vet assess the condition

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, the vet will conduct a comprehensive assessment — from physical examination to blood, urine, and imaging tests — to evaluate liver and portosystemic function.

Physical examination

palpation of the abdomen, assessment of temperature, mucous membrane colour, and lymph nodes

Complete blood count and biochemistry panel

evaluate liver and kidney function and electrolyte abnormalities

Urinalysis

check for abnormal metabolites, protein, and other indicators in the urine

Imaging

ultrasound or CT scan to localise and assess abnormal blood flow

Biopsy or specialist referral may be recommended to confirm the diagnosis when necessary

For complex cases, referral to a specialist hospital may be advised

04How is it treated and managed after diagnosis? Medications, dietary changes & care guide

Treatment must be tailored to each patient's condition, with a strong emphasis on post-op care and long-term follow-up to minimise the risk of complications.

Medications and interventions will be adjusted based on test results and clinical response
Follow dietary control or formula adjustments as recommended by your vet
Regular follow-up visits for blood work and imaging are required to monitor progress
Continue recording symptom changes at home and report them to your vet
If symptoms worsen or persist, referral to a specialist clinic for ongoing monitoring is recommended

05What should I prepare before the vet visit? Key information to help your vet diagnose quickly

Note when symptoms first appeared, how often they occur, and how they have changed over time

Bring a diet and elimination diary or relevant video footage

List all current medications and supplements being used

Bring any previous test reports, blood results, or imaging studies if available

Use a secure carrier and book your appointment by phone in advance

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.