CONDITION
Chronic Hepatitis in Dogs
Chronic hepatitis in dogs describes ongoing inflammation in the liver that persists over weeks to months, gradually affecting how the liver works. The liver has a remarkable capacity to compensate, which means signs often emerge slowly and can be subtle at first — things like reduced appetite, occasional vomiting, increased thirst, or a general sense that a dog is not quite themselves. In some cases, jaundice (a yellowing of the gums or skin) appears, or fluid begins to accumulate in the abdomen. Owners often arrive at this page after blood tests have shown changes in liver enzymes, or because a dog has been losing weight or seems less energetic over time. The condition can have many underlying causes — some related to the immune system, some to copper accumulation, some to infections, and in many cases the cause remains unclear even after investigation. This page explores the signs that may be observed, what is happening in the liver tissue itself, how chronic hepatitis is investigated through blood work and imaging, and the range of approaches that exist to support liver function and address underlying causes where they can be identified.
Why this matters now
Chronic hepatitis in dogs tends to be recognised in middle-aged to older animals, typically between four and ten years of age, though younger dogs can be affected. Certain breeds—including Bedlington Terriers, Dobermanns, Labrador Retrievers, Cocker Spaniels, and West Highland White Terriers—appear more frequently in clinical case series, which may reflect genetic factors influencing copper handling, immune regulation, or susceptibility to specific toxins. In many cases, the condition develops gradually without an obvious external trigger, though prolonged medication use, previous infections, or dietary copper imbalance may contribute in some individuals.
The condition often unfolds over months to years, with signs emerging slowly as the liver's compensatory capacity is gradually exceeded. Some dogs show steady, subtle decline in energy and appetite, while others experience periods of relative stability punctuated by episodes of vomiting or lethargy. The rate of progression varies widely between individuals and depends in part on the underlying cause, the degree of inflammation, and whether fibrosis—scarring of liver tissue—has begun to develop. In a proportion of cases, the disease eventually progresses to cirrhosis, a state in which normal liver architecture is replaced by scar tissue and the organ's function becomes more severely compromised.
Signals & patterns
Early signals
Reduced appetite or pickiness
A dog may begin leaving food in the bowl, eating more slowly, or showing less enthusiasm at mealtimes. This can be intermittent at first, making it easy to attribute to other factors such as stress or a change in routine.
Increased thirst and urination
The liver's role in processing waste products and maintaining fluid balance can be subtly disrupted, leading to a dog drinking more water and needing to go outside more frequently. Owners often notice the water bowl needs refilling more often or that the dog is asking to go out during the night.
Quieter than usual
A dog may seem less interested in play, slower to get up from rest, or less inclined to greet family members with the usual energy. The change can be so gradual that it is only clear in hindsight, particularly in older dogs where it may be mistaken for normal ageing.
Occasional vomiting
Episodes of vomiting may occur every few days or weeks, sometimes containing bile or undigested food. The pattern is often inconsistent, which can make it difficult to identify a clear cause without further investigation.
Weight loss despite normal eating
Some dogs continue to eat reasonably well but lose weight gradually over weeks to months. This reflects the liver's reduced ability to process nutrients and maintain normal metabolism, even when food intake appears adequate.
Later signals
Jaundice
A yellowing of the gums, the whites of the eyes, or the skin becomes visible when the liver can no longer process bilirubin efficiently. This tends to appear as the disease progresses and liver function becomes more significantly impaired.
Abdominal swelling
Fluid may begin to accumulate in the abdomen, a condition called ascites, which makes the belly appear distended or rounded. This reflects both changes in blood flow through the liver and reduced production of proteins that help keep fluid in the bloodstream.
Neurological changes
In some cases, dogs develop subtle behavioural changes such as disorientation, staring into space, or episodes of apparent confusion. These signs, sometimes grouped under the term hepatic encephalopathy, occur when the liver can no longer filter toxins from the blood effectively, allowing them to affect the brain.
Bleeding or bruising tendency
The liver produces many of the proteins involved in blood clotting, so as function declines, a dog may bleed more easily from minor injuries or show bruising under the skin. Owners may notice blood in the urine, stool, or prolonged bleeding from a small cut.
Click to read about the biological mechanisms
How this is usually investigated
Options & trade-offs
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