Hepatomegaly (Enlarged Liver) in Dogs & Cats: Symptoms, Ultrasound & Care Guide [2025]
Hepatomegaly is a clinical presentation of an enlarged liver — not a specific disease, but a sign of multiple underlying conditions. Possible causes include infection, tumours, and metabolic abnormalities; identifying and treating the root cause is essential.
When to See a Vet
Seek immediate veterinary care (emergency)
- •Persistent vomiting with inability to eat or drink
- •Obvious yellowing or discoloration of the eyes and skin
- •Persistent lethargy and difficulty being roused or engaged
Schedule a clinic visit soon (within 24–72 hours)
- •Noticeably reduced appetite lasting more than two days
- •Decreased activity level and unwillingness to move or play
- •Obvious changes in the color or frequency of bowel movements
01What symptoms indicate a problem?
Hepatomegaly in dogs and cats typically presents as non-specific systemic changes; further testing is needed to confirm the underlying cause.
- Reduced energy, sluggishness, or obvious lethargy
- Decreased appetite, pickiness, or gradual weight loss
- Reduced activity — reluctant to play or move around
- Changes in urination or defecation, or yellowing of the skin and mucous membranes (jaundice)
- Abnormal water intake (increased or decreased); monitor weight changes
Pet Health Map App
Turn every worry into your pet’s health record
Download the app to save AI Care reports, build your pet’s medical profile, and keep tracking symptoms and care notes.
Android version coming soon. The web version is available now.
02How to assess the situation at home? Key points for home monitoring and recognising emergencies
Home observation helps detect liver problems early and provides the vet with important information.
- Record appetite, food intake, and any refusal to eat at the same time each day
- Observe energy levels and activity; use your phone to record short video clips as evidence of changes
- Weigh your pet regularly and track trends, making it easier to monitor disease progression
- Note the colour and frequency of stools and urine; record any abnormalities with timestamps
- List all supplements and medications, and bring them to the vet appointment
03How will the vet make a diagnosis? Common diagnostic tests
The vet will use imaging and laboratory tests to evaluate liver size, structure, and function, and to rule out causes such as infection or tumours.
Abdominal ultrasound to assess liver size, texture, and blood flow
Blood biochemistry and serology to evaluate liver function markers
Cytology or fine-needle aspiration to obtain cell morphology information
Tissue biopsy (histopathology) to definitively identify the type and extent of lesions
Bacterial culture and parasite testing to rule out infectious causes
CT scan or advanced imaging to assist with surgical planning or further evaluation
Referral to a specialist hospital or veterinarian with experience in hepatic disease is recommended
04How is the condition treated and managed after diagnosis? Medication, dietary adjustments, and care guide
Liver disease treatment must be tailored to test results and combined with dietary management and long-term monitoring.
- Develop an individualised treatment plan based on pathology and test results
- Transition to a liver-friendly diet and manage caloric intake and protein sources
- Home care includes rest management and daily symptom monitoring and recording
- Regular follow-up appointments to track changes in blood biochemistry and necessary imaging results
- Assess disease progression and prognosis; refer to a specialist or consider advanced treatment as needed
05What to prepare before the vet visit? Key information to help the vet identify the cause quickly
This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.