What are the common causes of acute liver failure in dogs and cats?

Common causes include toxin exposure, infections, adverse drug reactions, and metabolic disorders. The underlying cause is identified through veterinary examination and testing — blood work, imaging, or biopsy — so appropriate treatment can be planned.

What tests does the vet use to assess liver function?

The vet typically runs blood tests for liver enzymes, bilirubin, coagulation, and electrolytes, combined with abdominal ultrasound or advanced imaging; a liver biopsy may be considered for a definitive diagnosis when necessary.

How long will my pet need to stay in hospital?

The length of hospitalisation varies with the severity of the condition and the response to treatment, ranging from a few days to several weeks. The vet will consider discharge once the pet is stable, eating independently, and fluid balance is restored.

What follow-up tests are needed after discharge?

Regular follow-up blood tests are typically needed to monitor liver enzymes, electrolytes, and coagulation; diet and medications may be adjusted based on results. Your vet will advise on the specific frequency.

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

Acute Liver Failure in Dogs & Cats: Symptoms, Diagnosis & Supportive Care [2025]

Acute liver failure is a medical emergency involving sudden, severe loss of liver function, which can be caused by toxins, medications, or infection. Urgent supportive therapy is needed to stabilise vital signs; prognosis depends on the underlying cause and degree of damage.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap editorial team

Sources: ACVIM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Marked, widespread yellowing of the whites of the eyes or the gums
•Repeated or persistent seizures and altered consciousness
•Continuous vomiting with inability to replenish needed fluids

Schedule a clinic visit soon (within 24–72 hours)

•Markedly reduced appetite with persistent unwillingness to eat
•Frequent diarrhea or a noticeable change in stool consistency
•Significant change in water intake or urination frequency

01What Symptoms Indicate a Problem?

Pets with acute liver failure often show marked changes in overall energy and digestive function — stay alert and monitor how symptoms progress over time.

Persistent lethargy and significantly reduced activity levels
Repeated vomiting with inability to eat normally or maintain adequate food intake
Ongoing diarrhoea or noticeable changes in bowel habits
Abnormally increased water intake or changes in urination frequency
Seizures, unsteady gait, or brief episodes of disorientation

Seek emergency care immediately if you notice the following symptoms:

⚠️ Obvious jaundice (yellowing of the whites of the eyes or gums)
⚠️ Repeated seizures or temporary loss of consciousness
⚠️ Persistent vomiting preventing adequate hydration

02How to Assess the Situation at Home: Key Observations and When to Seek Emergency Care

Before heading to the clinic, carefully record your pet's symptoms and any changes at home — this information helps the vet quickly assess the situation and prioritise investigations.

Note the date and time symptoms began and track how they have changed over time
Count and record the number of vomiting episodes per day along with when they occur
Record stool consistency (blood or mucus) and any changes in bowel movement frequency
Measure and record daily water and food intake
Use your phone to video any seizures or unusual behaviour for the vet to review
If symptoms worsen rapidly, arrange a clinic visit or emergency consultation as soon as possible

03How Does the Vet Diagnose This? Common Diagnostic Tests

At the clinic, the vet will perform a thorough physical examination along with imaging and laboratory tests to assess liver function and identify the underlying cause; referral for advanced diagnostics may be recommended if needed.

Physical examination

assess for jaundice, dehydration, and abdominal pain on palpation

Blood work

liver enzymes, bilirubin, coagulation profile, and electrolytes

Abdominal ultrasound or X-ray

evaluate liver size, structure, and surrounding organs

Advanced imaging (CT/MRI) or liver biopsy to clarify the underlying cause

Referral to a specialist facility offering advanced imaging and liver biopsy may be advised

04How Is It Treated and Managed? Medications, Dietary Changes, and Care Guide

Acute liver failure is managed primarily with supportive therapy; close monitoring of blood values and clinical signs is essential both during treatment and after discharge.

Inpatient intravenous fluids to correct dehydration and electrolyte imbalances
Supplemental oxygen or other supportive care as needed to maintain vital signs
Symptomatic treatment and medication adjustments based on the vet's assessment
Feed a low-burden, high-moisture, easily digestible prescription diet
Regular blood tests to monitor liver enzymes, coagulation, and electrolytes
Schedule follow-up appointments and follow home care instructions as directed by your vet

05What to Prepare Before the Vet Visit: Key Information to Help Your Vet Act Quickly

Bring a written symptom log including when symptoms started and how they have progressed

Prepare specific records of vomiting episodes, diarrhoea frequency, and daily water intake

List all current medications, supplements, and vaccination history

Bring any previous test results or imaging for comparison if available

Transport your pet in a secure carrier and arrange the appointment as promptly as possible

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.