강아지 간 종양(원발·전이) 증상과 원인, 진단·치료와 관리 포인트 총정리

Liver Tumors in Dogs? — From Primary and Metastatic Symptoms to Diagnosis and Treatment

Liver HealthDiseasesMeongsiljang Veterinary Advisory Board

Canine liver tumors can be either primary or metastatic, and early detection significantly improves treatment success rates. Although symptoms are often nonspecific, close observation is essential.

What Are Canine Liver Tumors (Primary and Metastatic)?

Anatomical image of a dog with a liver tumor

Canine liver tumors are growths that develop within the liver and can be either benign, such as hepatic adenomas or hepatocellular adenomas, or malignant, including hepatocellular carcinoma and cholangiocarcinoma. They are classified as primary or metastatic based on their origin. Primary tumors arise directly from liver cells, such as hepatocellular carcinoma (often associated with elevated ALT levels) or cholangiocarcinoma originating from bile duct cells (often associated with elevated ALP levels). However, primary liver tumors are relatively rare. Because the liver has a rich blood supply, it is a common site for metastatic lesions, where cancer spreads from other parts of the body. In the early stages, symptoms are often minimal, making detection difficult; by the time clinical signs appear, the disease is frequently advanced. As liver function declines, dogs may experience decreased appetite, weight loss, and lethargy. Therefore, regular veterinary check-ups and consistent health management are essential.

What Are the Main Causes of Liver Tumors in Dogs?

The exact cause of liver tumors in dogs remains unclear, but it appears to result from a combination of several factors. - Chronic hepatocellular changes: Some reports suggest that chronic changes in liver cells (such as vacuolar hepatopathy) may progress to hepatocellular carcinoma. - Steroid and endocrine influences: Liver cell changes resulting from long-term steroid administration, among other factors, may be associated with tumor development. - Breed predisposition: The liver is the third most common site for hemangiosarcoma, which is known to occur more frequently in Golden Retrievers and Labrador Retrievers, warranting indirect caution. - Age: Tumorous conditions are more commonly reported in senior dogs. Since there is no established method for prevention, early detection through regular veterinary check-ups is the most practical approach.

What Are the Main Symptoms of Liver Tumors in Dogs?

Liver tumors in dogs often show few or no symptoms in the early stages. However, as the condition progresses, the following signs may appear, and a veterinary visit is necessary if any of these symptoms are observed.

Loss of appetite: Your dog may eat poorly or consume less food than usual.

Weight loss: Weight may decrease alongside reduced appetite.

Vomiting: Digestive symptoms such as vomiting may recur.

Jaundice: Elevated bilirubin levels can cause the eyes or mucous membranes to appear yellow.

Abdominal distension (hepatomegaly): The abdomen may swell as the liver enlarges.

Lethargy: Your dog may show decreased energy and reluctance to move.

However, if only a portion of the liver is affected, liver function tests may still return normal results, making it difficult to diagnose based on symptoms alone.

Image of a dog's face showing symptoms of jaundice

Signs Requiring Immediate Veterinary Care

If jaundice appears, or if persistent vomiting and loss of appetite last for more than two days, immediate veterinary care is necessary. These signs may indicate severe liver damage.

How Are Liver Tumors in Dogs Diagnosed?

Diagnosing liver tumors in dogs requires a comprehensive approach using multiple tests. - Blood tests: We assess liver function by checking liver enzyme levels, total protein, albumin, and other indicators. - Ultrasound: This allows for precise evaluation of the tumor’s location, size, number, and blood flow. - CT/MRI scans: These imaging techniques are valuable for determining the tumor’s exact shape and checking for metastasis. - Biopsy: A tissue sample is taken to definitively identify the type of cancer and its grade of malignancy. - Metastasis assessment: We examine other areas, such as the lungs and lymph nodes, to determine if the cancer has spread. Together, these tests enable us to establish an accurate diagnosis and develop an appropriate treatment plan.

A puppy undergoing an abdominal ultrasound examination.

How Are Liver Tumors in Dogs Treated?

The treatment plan depends on the tumor’s characteristics and stage of progression. - Surgical treatment: If the tumor is localized and removable, it can be surgically excised. - Chemotherapy: If metastasis is suspected or surgery is not feasible, medication is used to suppress cancer cell growth. - Radiation therapy: Targeted radiation is applied to specific areas to shrink the tumor. - Supportive care: This may include immune boosters, anti-inflammatory medications, and nutritional supplements. - Pain management: Appropriate pain relief medication is prescribed if the pet is experiencing discomfort. - Individualized treatment: Your veterinarian will work with you to develop the optimal treatment plan tailored to your pet’s condition.

A puppy undergoing chemotherapy at the hospital

Home Care and Management Points

Dogs with liver tumors require careful, attentive care at home. - Diet management: Consult your veterinarian to choose a diet that minimizes stress on the liver, and offer small, frequent meals. Whether protein should be restricted depends on your dog’s individual condition, so do not make this decision on your own. - Nutritional support: Consistently administer any supplements recommended by your veterinarian. - Activity management: Avoid excessive exercise and ensure your dog gets plenty of rest in a comfortable environment. - Regular check-ups: Schedule routine veterinary examinations to monitor changes in your dog’s condition. - Emotional well-being: Your warm care and a stable daily routine are essential for your dog’s peace of mind. - Symptom monitoring: Seek immediate veterinary attention if you notice any abnormal signs, such as vomiting, loss of appetite, or jaundice.

A puppy enjoying liver-supportive dog food

Certain Breeds Require Special Attention

The liver is an organ where hemangiosarcoma commonly develops and metastasizes, and this cancer is known to occur more frequently in breeds such as Golden Retrievers and Labrador Retrievers. For dogs of these breeds, please pay special attention to regular check-ups and health management.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can liver tumors in dogs be treated?

The treatment approach depends on the type of tumor, whether it can be surgically removed, and whether it has metastasized. If the tumor is localized and can be excised, surgery is typically the first option. However, if metastasis is already present at the time of diagnosis, treatment focuses on alleviating symptoms rather than achieving a cure.

No, liver tumors are not genetically inherited.

Tumors themselves aren't hereditary. However, hemangiosarcoma, which commonly develops in the liver, is known to occur more frequently in breeds like Golden Retrievers and Labrador Retrievers, so owners of these breeds should be especially vigilant.

What is the prognosis for a liver tumor?

The prognosis varies significantly depending on the type of tumor, whether it can be surgically removed, and whether it has metastasized. If metastasis is present, the prognosis is generally poor, and treatment focuses on palliative care. A specific life expectancy can only be determined through an individual assessment by your veterinarian.

What tests should be performed if a liver tumor is suspected?

Diagnosis is made through blood tests (including liver enzymes), abdominal ultrasound, and, if necessary, CT scans and fine-needle aspiration (FNA) biopsies. It’s best to consult with your veterinarian to develop an appropriate diagnostic plan.

What should I feed my dog with a liver tumor?

To minimize the burden on the liver, offer small, frequent meals. Since dietary plans, including protein restriction, vary depending on the patient’s condition, it is best to consult with your veterinarian to determine the appropriate approach. Rather than making arbitrary changes to the diet, follow professional guidance.

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References

[1] Nolan, M.W. et al. (2013). Stereotactic radiation therapy for treatment of injection-site sarcomas in cats: 11 cases (2008–2012). Journal of the American Veterinary Medical Association, 243(4), 526–531.

[2] Penninck, D.G. et al. (1998). Ultrasonography of canine gastric epithelial neoplasia. Veterinary Radiology & Ultrasound, 39(4), 342–348.

[3] Vet Surgical Oncology, 2nd Ed. (2013). Chapter 2, Cell tumors and grade I and II soft tissue sarcomas in dogs.