Symptoms and Treatment of Feline Fatty Liver Disease

Liver HealthQ&AMeongsiljang Veterinary Advisory Board

If a cat doesn’t eat for several days, fat can build up in the liver, leading to a condition called fatty liver disease. We’ll explain the symptoms, causes, treatment options, and how you can help manage your cat’s health at home.

Why Is Feline Fatty Liver Disease Dangerous?

A lethargic cat lying listlessly beside its food bowl

Feline fatty liver disease occurs when fat builds up excessively in the liver after a cat goes without eating for several days. In veterinary internal medicine textbooks, it is referred to as hepatic lipidosis. It is one of the most common liver diseases in cats, and the risk is particularly high in overweight cats. If detected early and aggressive nutritional therapy is initiated, complete recovery is possible. However, the prognosis may worsen if the condition is severe or accompanied by incurable underlying diseases. In any case, neglecting the condition can lead to liver failure, making early intervention crucial.

What Causes Feline Fatty Liver Disease?

Feline fatty liver disease usually begins with a loss of appetite. According to veterinary textbooks, the underlying causes of anorexia are often gastrointestinal disorders, pancreatitis, or cholangitis; if no clear cause is identified, it is classified as idiopathic. If your cat’s appetite drops due to stress from moving or environmental changes, it is essential to rule out any underlying medical conditions. When a cat refuses food for several days, the body rapidly mobilizes body fat to the liver to generate energy. This fat accumulates within liver cells, impairing liver function. Overweight cats are at particularly high risk because their larger fat reserves lead to a greater volume of fat being transported to the liver.

Suspect Fatty Liver Disease If You Notice These Symptoms

Loss of appetite: Your pet eats nothing or only a tiny amount for two days or more.

Jaundice: The inner ears, gums, and whites of the eyes turn yellow.

Vomiting: Impaired liver function makes digestion difficult, leading to frequent vomiting.

Lethargy: Activity levels drop below normal, and your pet spends more time hiding.

Weight loss: Noticeable weight loss occurs over a short period.

Dehydration: When you pinch and release the skin on the back of the neck, it returns slowly.

Excessive drooling: Nausea can cause excessive drooling.

A veterinarian examining a cat’s eyes and gums.

Go to the Vet Immediately in These Cases

If your cat hasn’t eaten at all for two days or more and you notice yellowing in their eyes or gums, there’s a high chance that fatty liver disease has already progressed. It’s important to visit the vet as soon as possible. Fatty liver disease has a good prognosis if treatment is started early, but the longer it goes untreated, the greater the risk of liver failure.

How Is It Diagnosed at the Veterinary Clinic?

Veterinarians typically start by checking liver enzyme and bilirubin levels through blood tests, which are noticeably elevated in cases of fatty liver disease. An abdominal ultrasound is used to assess the liver’s size and internal condition. A definitive diagnosis is made via fine-needle aspiration cytology, where a small sample of liver cells is collected; if more than 80% of the cells are filled with fat, a diagnosis of fatty liver disease is confirmed. Textbooks advise against performing a liver biopsy using a larger needle to remove tissue, unless other hepatobiliary diseases are suspected. It is also crucial to check for any underlying conditions that may have triggered the fatty liver, as gastrointestinal disorders, pancreatitis, and cholangitis are often present. If the root cause remains unidentified despite thorough investigation, the condition is classified as idiopathic.

How Is It Treated?

The cornerstone of treating fatty liver disease in cats is adequate nutritional support. If a cat cannot eat on its own, a veterinarian will place a feeding tube to deliver high-calorie nutrition directly. Esophageal feeding tubes are the most commonly used, though nasogastric tubes may be employed depending on the patient’s condition. Tube feeding typically continues for several weeks, and veterinary textbooks report that cats who receive early, aggressive nutritional therapy can achieve full recovery. However, the prognosis may be poorer if severe or incurable underlying conditions, such as lymphoma, are present. Concurrently, dehydration is corrected with intravenous fluids, and any underlying cause is treated simultaneously.

A cat receiving nutrition through a feeding tube at the veterinary clinic

Manage Care at Home After Discharge Like This

If your pet is discharged with a feeding tube, you’ll need to administer meals at home. It’s crucial to follow the veterinarian’s instructions regarding the amount and frequency of feedings. Clean the skin around the feeding tube daily, and rinse the tube with lukewarm water before and after each feeding. To minimize the risk of vomiting, administer the nutritional formula slowly. Once your cat begins to eat small amounts of food on its own, consult your veterinarian to determine the appropriate time for tube removal. Keeping a daily record of weight and appetite changes during recovery can be very helpful.

A caregiver administering nutrition to a cat via a feeding tube at home

Prevention Is the Best Option

Fatty liver disease in cats is preventable. The key is to avoid situations where your cat suddenly stops eating. During stressful events—such as moving, adding new family members, or changing food—be sure to monitor their food intake closely. For overweight cats requiring weight loss, sudden dietary restriction is strictly off-limits. Weight reduction must be planned and carried out gradually under veterinary guidance to avoid stressing the liver; abruptly reducing or stopping food on your own can actually trigger fatty liver disease.

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

Will a cat develop fatty liver disease if it doesn’t eat for just one day?

A day without eating is usually not a problem. However, if your cat doesn't eat at all for more than two to three days, it can become dangerous. This is especially true for overweight cats, as the condition can progress more quickly. If your cat refuses food for more than a day, keep a close eye on them and consider visiting the vet.

Does attaching a feeding tube cause a lot of discomfort for cats?

Your cat may feel uncomfortable at first, but most cats adapt within 1-2 days. A feeding tube is a vital treatment for sustaining life, and when properly managed, complications are rare.

Can skinny cats get fatty liver disease?

Yes, while it's more common in overweight cats, even thin cats can develop fatty liver disease if their loss of appetite persists for a long time. Regardless of weight, the situation itself where a cat refuses to eat is a risk factor.

Can fatty liver disease recur after it has been fully treated?

With proper treatment, a full recovery is possible. However, if the underlying condition isn’t managed or if your pet goes without food for an extended period again, the condition may recur. Maintaining regular meal times and scheduling routine health check-ups are essential.

How can I check for jaundice in my cat at home?

Check the skin inside the ears, the gums, and the whites of the eyes. If they appear more yellow than usual, it could be jaundice. This is easier to spot in white cats, but for cats with darker fur, you’ll need to look more closely at the gums and eyes.

Top 5 Milk Thistle (Silymarin) Liver Supplements for Dogs — A Comparison Guide Based on Silybin Content and Absorption Rates

Top Prescription Diets for Dogs with Liver Disease and Selection Criteria

Top 5 Recommended Feline SAMe & Milk Thistle Liver Supplements — Ingredient, Bioavailability, and Weight-Based Selection Criteria

Principles and Applications of Exosome Therapy for Dogs

Understanding Canine Korean Medicine (Acupuncture and Herbal Medicine)

Types and Necessity of Canine Genetic Testing

Preparation Checklist for First-Time Cat Owners

Checklist for Preparing to Raise Your First Puppy

Rescue Dog Adoption Procedures and Precautions – What You Must Know Before Adopting

A Complete Guide to Cat Vaccination Costs

References

[1] Center SA. Feline Hepatic Lipidosis. Veterinary Clinics of North America: Small Animal Practice, 2005;35(1):225-269

[2] Valtolina C, Favier RP. Feline Hepatic Lipidosis. Veterinary Clinics of North America: Small Animal Practice, 2017;47(3):683-702

[3] Armstrong PJ, Blanchard G. Hepatic Lipidosis in Cats. Veterinary Clinics of North America: Small Animal Practice, 2009;39(3):599-616

[4] Webb CB. Hepatic Lipidosis: Clinical Review Drawn from Collective Effort. Journal of Feline Medicine and Surgery, 2018;20(3):217-227