Cat Not Eating: How Long Is Too Long, and What to Do

An adult cat that skips one meal is usually fine. A cat that has eaten nothing for 24 hours is not, and the difference matters more in cats than in dogs. Cats are not built to fast: after roughly two to three days without adequate calories, the liver starts mobilising fat faster than it can process it, and fat accumulates in liver cells. That is hepatic lipidosis, a serious disease that most often hits overweight cats who stop eating for any reason at all. So the practical rule is simple: 24 hours of complete refusal in an adult cat means a phone call to your vet; 48 hours, or any refusal in a kitten, means the cat is seen.

First, is the cat really not eating?

Cats are good at hiding intake. A cat may eat a few biscuits at 3 a.m. and look anorexic to you. Weigh the food bowl, or weigh the cat: a kitchen scale accurate to 50 g is enough for most cats and far more reliable than impressions. Check for a second food source — neighbours, another cat's bowl, a bin, hunting. Also check water intake; a cat that stops drinking as well is more concerning than one still drinking normally. Note whether the cat shows interest in food but walks away after a sniff. That is a different problem from showing no interest at all.

Common causes, from minor to serious

Usually minor: a new food or a new bowl, a house move, a new pet or baby, visitors, a change in feeding time, hot weather, or a recent vaccination causing 24 to 48 hours of mild lethargy. Stress-related appetite loss in a healthy cat usually resolves in a day or two once the trigger settles.

Needs a visit soon: dental pain (very common and badly under-diagnosed), nausea from mild gastroenteritis, hairballs, constipation, parasites, or an upper respiratory infection where a blocked nose means the cat cannot smell the food.

Serious: pancreatitis, kidney disease, liver disease, hyperthyroidism, diabetes, cancer, an intestinal obstruction, or a foreign body. Toxin exposure — lilies, antifreeze, human medication — is an emergency. A cat that stops eating and also hides, vomits, or seems painful is in this group until proven otherwise.

Why cats cannot just "wait it out"

The liver risk is the main reason, but not the only one. A cat that stops eating also stops taking in water, and dehydration worsens nausea, which reduces appetite further — a loop that is hard to break at home. Cats with kidney disease lose protein and muscle quickly. Diabetic cats on insulin can become hypoglycaemic if they refuse food after a dose. Overweight cats are at the highest risk of hepatic lipidosis, which is unfair but consistent: the fattest cats decompress fastest.

What you can do at home

Make the food easy to notice. Warm wet food to body temperature — about 37 °C, tested on your wrist — because aroma drives feline appetite and cold food smells of nothing. Offer strong-smelling options: sardines in water, tuna water (not oil, not the fish itself in quantity), or a veterinary recovery diet. Try a flat plate rather than a deep bowl, since whisker contact puts some cats off. Feed in a quiet room away from the litter box and other cats, and sit nearby without staring. Hand-feeding, or offering food from a spoon, works surprisingly often. Gentle syringing of water is acceptable; syringing food is not.

What not to do

Do not force-feed. Force-feeding a nauseated cat causes aversion to food, aspiration risk, and stress that makes things worse. Do not leave food down for 12 hours hoping the cat will get round to it — offer small amounts and take them away after 20 to 30 minutes, then reoffer. Do not give human appetite stimulants or steroids. Do not switch to a completely new food every few hours; pick two options and rotate them. Never give cow's milk, and never give a diabetic cat insulin if it has refused a full meal — call your vet first.

When to see a vet the same day

• No food at all for 24 hours in an adult cat, or 12 hours in a kitten.
• Any cat that is also vomiting, diarrhoea, or lethargic.
• Hiding, trembling, or crying when picked up.
• Gums, ear leather, or the whites of the eyes look yellow.
• Drooling, pawing at the mouth, or dropping food while eating.
• A male cat straining in the litter box with little or no urine — urethral obstruction kills within days and is an emergency.
• Weight loss you did not plan, especially with a good appetite.
• Refusal to eat after insulin, or a diabetic cat that is weak or wobbly.

Getting nutrition in when the cat will not eat

If a cat has eaten nothing for 36 to 48 hours, appetite stimulants, anti-nausea medication, and assisted feeding are all legitimate veterinary tools. A feeding tube sounds drastic but is often the kindest option: it delivers calories without a fight, is usually temporary, and dramatically improves survival in hepatic lipidosis. Cats recover well from short-term tube feeding. Ask about it early rather than treating it as a last resort. For more on reading feline body condition and feeding amounts, see our health guides and the routines in care.

This is general information, not a diagnosis.

Frequently asked