Understanding Liver Disease in Dogs
The liver is one of the most vital organs in your dog's body, responsible for filtering toxins from the blood, producing bile for digestion, synthesising proteins, and storing essential nutrients. When the liver becomes damaged or diseased, it can have wide-ranging effects on your dog's overall health. Liver disease is among the more frequently diagnosed conditions in dogs across Europe, and early detection is key to successful management.
Veterinary bodies across the EU, including the European College of Veterinary Internal Medicine (ECVIM), have highlighted the importance of routine screening for liver disease, particularly in predisposed breeds. Understanding what can cause liver disease and how to recognise its signs could make a significant difference to your dog's quality of life.
Common Causes of Liver Disease in Dogs
Liver disease in dogs can arise from a wide variety of causes, which is why it is often described as a syndrome rather than a single condition. The most frequently identified causes include:
- Toxins and medications: Certain plants, fungi, and household chemicals are highly toxic to the liver. Some medications — including certain anti-inflammatory drugs and antiparasitic treatments — can also cause liver damage if used incorrectly or over prolonged periods.
- Viral and bacterial infections: Canine infectious hepatitis, caused by canine adenovirus type 1, is one of the better-known infectious causes. Leptospirosis, a bacterial infection prevalent across much of continental Europe, can also severely damage liver tissue. ESCCAP guidelines recommend regular vaccination against leptospirosis for dogs in endemic regions.
- Genetic and breed-specific conditions: Some breeds carry inherited tendencies towards liver disease. Bedlington Terriers are prone to copper storage disease, in which copper accumulates in the liver to toxic levels. Dobermanns are susceptible to a chronic hepatitis that can progress to cirrhosis. Labrador Retrievers, West Highland White Terriers, and Cocker Spaniels are also more commonly affected than average.
- Portosystemic shunts: These are abnormal blood vessel connections that allow blood to bypass the liver, depriving it of the nutrients and detoxification it needs. They can be congenital or acquired.
- Cancer: Primary liver tumours or metastatic cancer from elsewhere in the body can affect hepatic function.
- Chronic inflammation: Long-term inflammatory conditions within the liver — broadly termed chronic hepatitis — can gradually destroy liver tissue and lead to cirrhosis.
Recognising the Symptoms
One of the challenges with liver disease in dogs is that the liver has a remarkable capacity to compensate for damage, meaning clinical signs may not appear until a significant portion of liver function has been lost. When symptoms do emerge, they can include:
- Jaundice: A yellowing of the skin, whites of the eyes, and gums caused by a build-up of bilirubin. This is a tell-tale sign that warrants immediate veterinary attention.
- Vomiting and diarrhoea: Often one of the earliest and most non-specific signs, sometimes accompanied by loss of appetite.
- Lethargy and weakness: Dogs with liver disease often seem unusually tired or disinterested in normal activities.
- Increased thirst and urination: Known as polydipsia and polyuria, these signs can occur as the kidneys compensate for reduced liver function.
- Ascites: A build-up of fluid in the abdomen, causing a visibly swollen belly. This is more common in advanced disease.
- Behavioural changes: In some cases, toxins that the liver can no longer filter may affect the brain, leading to confusion, disorientation, or seizures — a condition known as hepatic encephalopathy.
- Weight loss: Gradual loss of body condition is common in chronic liver disease.
Diagnosis: What Your Vet Will Do
If your vet suspects liver disease, they will typically begin with blood tests, including a full biochemistry panel to measure liver enzymes such as ALT, ALP, GGT, and bilirubin. Elevated levels of these enzymes indicate liver cell damage or bile flow obstruction. A complete blood count may also reveal anaemia or changes in white blood cell numbers.
Abdominal ultrasound is an invaluable diagnostic tool, allowing the vet to assess the size, shape, and texture of the liver and to identify any masses, abnormal blood vessels, or fluid accumulation. In many cases, a fine-needle aspirate or biopsy of the liver will be required to confirm a specific diagnosis, including identifying the extent of inflammation, fibrosis, or copper accumulation.
Urine analysis may also be performed to look for abnormal bile acids or the characteristic crystals associated with certain metabolic conditions.
Treatment Options
Treatment depends heavily on the underlying cause. Where a specific trigger such as toxin exposure or infection can be identified and addressed, the prognosis can be significantly better.
- Dietary management: A liver-supportive diet is a cornerstone of treatment. These diets are typically lower in copper, highly digestible, and contain moderate levels of high-quality protein. Your vet may prescribe a specific veterinary diet, or you can find suitable options through retailers such as Zooplus, which stock a range of veterinary and premium liver-support formulas.
- SAMe (S-Adenosylmethionine): This naturally occurring compound supports liver cell repair and acts as an antioxidant. It is widely used by European vets as a hepatoprotective supplement and is available in various formulations.
- Milk thistle (silymarin): A popular herbal supplement used alongside conventional treatment to support liver function. Many vets across Europe recommend it as a complementary therapy.
- Medications: Depending on the diagnosis, treatment may include antibiotics, anti-inflammatory drugs, copper chelators (for copper storage disease), or diuretics to manage fluid accumulation.
- Surgery: In the case of portosystemic shunts or certain tumours, surgical intervention may be required.
Prevention and Long-Term Management
Preventing liver disease is not always possible, particularly in genetically predisposed breeds. However, there are practical steps every owner can take to reduce risk. Keeping your dog's vaccinations up to date — including against canine hepatitis and leptospirosis — is essential, particularly for dogs that spend time in the countryside or near water, where leptospirosis risk is higher in many EU countries.
Avoiding exposure to known toxins, including certain mushrooms, blue-green algae, and inappropriate medications, is equally important. Annual blood tests are recommended for senior dogs and breeds known to be susceptible to liver problems, as they can identify early abnormalities before symptoms appear.
With the right care, many dogs with liver disease can enjoy a good quality of life for months or years. Close collaboration with your vet and regular monitoring are the most important tools you have.