Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Liver disease in dogs doesn’t have a single staging system like kidney disease, but chronic liver disease often progresses through recognizable phases: inflammation (hepatitis), scarring (fibrosis), and in severe cases cirrhosis with liver failure. Early phases often have few signs and respond best to treatment. Biopsy is the only way to know exactly how advanced it is.
Phase 1: inflammation
- Raised liver enzymes, often with no signs
- The best time for treatment, which may slow or stop progression
Phase 2: fibrosis
- Scar tissue forms as inflammation continues
- Signs may be mild or vague
- Treatment still helps
Phase 3: cirrhosis and liver failure
- Extensive scarring and reduced function
- Signs include jaundice, fluid in the belly, weight loss, bleeding problems, and confusion (hepatic encephalopathy)
- Treatment focuses on managing complications and comfort
How vets assess it
- Bloodwork and bile acids
- Ultrasound
- Liver biopsy, the most accurate way to assess inflammation, scarring, and copper levels
Why early diagnosis matters
The liver can regenerate if damage is stopped early. Treating the cause, such as copper buildup or inflammation, can prevent progression.
Sources
- Webster CRL, et al. ACVIM consensus statement on the diagnosis and treatment of chronic hepatitis in dogs. J Vet Intern Med. 2019
- Merck Veterinary Manual: Hepatic disease in small animals
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.