How do I know if my dog has liver problems?

The most common symptoms are loss of appetite, vomiting, lethargy, increased thirst and dark orange or yellowish urine. In more advanced cases, jaundice appears (yellow tint to the gums, whites of the eyes and skin). A blood test with a liver panel (ALT, AST, ALP, bilirubin) confirms or rules out the problem.

Can infectious hepatitis in dogs be prevented?

Yes. The canine adenovirus type 1 (CAV-1) vaccine, included in the standard combination vaccine (DHPP or similar), provides very effective protection against infectious canine hepatitis. A dog with up-to-date vaccinations has a very low risk of contracting it.

What should a dog with hepatitis eat?

A low-copper diet with high-quality, digestible protein supports liver recovery. Your vet may recommend specific hepatic diets (e.g. Hill's L/D or Royal Canin Hepatic). Avoid supplements or herbs without veterinary supervision — some can worsen liver function.

Dog Hepatitis: Symptoms, Causes and Treatment

Why the liver matters so much

The liver performs over 500 functions: metabolising nutrients, filtering toxins from the blood, producing bile for fat digestion, manufacturing essential proteins and regulating clotting. When it fails, almost every body system is affected.

Canine hepatitis is inflammation of the liver and can be acute (sudden onset) or chronic (developing over months or years). Depending on the cause, it is classified as infectious, toxic, immune-mediated or idiopathic.

Main causes

Infectious canine hepatitis (adenovirus CAV-1)

The classic form, caused by canine adenovirus type 1. Now rare thanks to vaccination, but can be severe or fatal in unvaccinated dogs. Transmitted by contact with urine, faeces or secretions from infected dogs.

Toxic hepatitis

Many agents can damage the liver: medications (paracetamol, NSAIDs, anticonvulsants), toxic plants (xylitol, Amanita mushrooms), pesticides, heavy metals (copper, zinc) or even excessive supplements. A common and underestimated cause.

Idiopathic chronic hepatitis

Liver inflammation of unknown cause that progresses slowly. More common in Cocker Spaniels, Dobermanns, Labradors and Bedlington Terriers. Copper accumulation in the liver may be a factor in some breeds.

Immune-mediated hepatitis

The immune system attacks liver tissue. May be associated with other autoimmune diseases or occur in isolation.

Symptoms: when to suspect liver disease

Loss of appetite and progressive weight loss.
Vomiting and nausea, especially in the morning.
Lethargy and weakness.
Polydipsia and polyuria (increased thirst and urination).
Very dark (brown-orange) urine or pale/greyish stools.
Jaundice: yellow tinge to the gums, whites of the eyes and skin (visible on the belly in light-coated dogs). A sign of significant liver dysfunction.
Distended abdomen from fluid accumulation (ascites) in advanced cases.
Confusion or abnormal behaviour (hepatic encephalopathy).

Diagnosis

Blood tests: the liver panel measures ALT, AST, GGT, alkaline phosphatase (ALP) and bilirubin. Fasting and post-prandial bile acids assess real liver function.

Abdominal ultrasound: evaluates the size, echogenicity and structure of the liver, detects masses or diffuse changes.

Liver biopsy: needed to differentiate hepatitis types, assess degree of fibrosis and guide treatment. Can be done by laparoscopy, ultrasound-guided needle or surgery.

Treatment

IV fluid therapy: in acute cases to restore hydration and electrolytes.
Remove the causative agent: in toxic cases, stopping exposure is urgent.
Hepatoprotectants: SAMe (S-adenosylmethionine), silymarin (milk thistle) and vitamin E — reduce oxidative damage to liver cells.
Specific hepatic diet: low in copper, highly digestible quality protein, high in antioxidants.
Immunosuppressants: in immune-mediated hepatitis, corticosteroids (prednisone) or azathioprine.
Antibiotics: for infectious component or to prevent secondary infections.
Hepatic encephalopathy management: oral lactulose, protein-restricted diet and enemas if ammonia accumulation is present.

Prognosis and prevention

Prognosis depends heavily on cause and timing of diagnosis. Acute toxic hepatitis detected early has a good prognosis if the agent is removed and treatment starts promptly. Well-managed chronic hepatitis can be stable for years. Severe infectious hepatitis in unvaccinated dogs can be fatal within 24–48 hours.

Prevention:

Keep vaccinations up to date (includes CAV-1 protection).
Never give human medications (especially paracetamol or ibuprofen — toxic to dogs).
Species-appropriate, vetted nutrition — no unsupervised supplements.
Annual blood panel in dogs over 7 years old to catch changes early.