Why Won't My Cat Eat?

The first thing to establish is not why but how long. A cat that has eaten nothing for 24 to 48 hours needs veterinary attention, because cats tolerate fasting badly and are at risk of hepatic lipidosis — a serious liver condition that can develop within days, and one that overweight cats are more prone to rather than less. That makes a refusing cat different from a refusing dog, where waiting it out is often reasonable. Beyond the time limit, the causes divide into medical, dental, environmental and simple preference. This page covers all four, in the order worth checking. Portion figures, if underfeeding turns out to be part of it, are in the cat food calculator.

The Time Limit Comes First

Before working out the cause, establish how long it has been.

Why cats are different. When a cat stops eating, the body mobilises fat for energy faster than the liver can process it, and fat accumulates in the liver. That is hepatic lipidosis, and it is serious, self-reinforcing — a cat that feels ill eats less, which makes it more ill — and can develop within a few days.

Overweight cats are at higher risk, which is the opposite of what intuition suggests, because there is more fat to mobilise.

So "he'll eat when he's hungry" is sound advice for a dog and unsafe for a cat. Whatever else is going on, the priority is getting food into the cat.

The Pattern Tells You Something

How a cat refuses is as informative as that it refuses.

Approaches, sniffs with interest, then turns away. This is the important one. A cat that clearly wants to eat and then does not is usually experiencing nausea or mouth pain. It is not fussiness, and it warrants a vet visit.

Ignores food entirely, no interest at all. More consistent with feeling generally unwell, or with a strong preference against that particular food.

Eats slowly, drops food, chews on one side, or tilts the head. Points at the mouth — dental disease, a broken tooth, ulceration, or something stuck.

Eats then vomits shortly after. Could be eating too fast, but repeated vomiting needs investigating.

Eats only treats, refuses meals. Usually behavioral, though it can mask early nausea — a cat with mild nausea will often still take something highly palatable.

Suddenly refuses a food it has eaten happily for years. Check the bag or pouch date and smell it before concluding anything about the cat. Dry food goes rancid as the fat coating degrades, and cats detect it long before people do.

Medical Causes

The list worth having in mind, though diagnosis belongs with a vet.

Dental disease. Extremely common in cats and largely invisible until advanced. Painful teeth, resorptive lesions and gum disease all make eating uncomfortable, and cats frequently keep trying rather than showing obvious signs.

Kidney disease. Common in older cats. Causes nausea and a gradual reduction in appetite, often alongside increased drinking and weight loss.

Gastrointestinal problems, including inflammatory disease, obstruction and parasites.

Hyperthyroidism usually causes increased appetite — but in some cats it presents the other way, and it can produce vomiting that puts a cat off food.

Pancreatitis, which causes nausea and abdominal discomfort.

Infection or fever of any kind.

Pain anywhere. A cat with arthritis may struggle to get to the bowl or to crouch comfortably over it, which looks like a lost appetite but is a mobility problem.

Medication side effects, including some antibiotics.

And upper respiratory infection, which blocks the nose. Cats will not eat what they cannot smell, so a congested cat often stops eating entirely — this is a very common cause in kittens and in cats recently in a shelter.

Practical Things to Try

While arranging veterinary advice, not instead of it.

Warm the food. Wet food at just below body temperature smells far stronger, and smell drives feline appetite far more than taste. A few seconds in the microwave, stirred through and tested with a finger. Never serve it hot. This single change works more often than anything else on the list.

Use a wide, shallow dish. Many cats dislike their whiskers touching the sides of a deep bowl, and it is a common and easily fixed reason for picking at food.

Move the bowl. Away from the litter tray, away from washing machines and boilers, away from where another cat can loom over it, and out of a corner where the cat cannot see the room.

Offer strong-smelling food — a plain, unseasoned option or something the cat has always liked. Something eaten is better than nothing eaten.

Hand-feed a little. Some cats will take food from a finger when they will not approach a bowl.

Feed little and often, in small fresh portions, rather than leaving one bowl down to go stale.

Reduce stress. New pets, building work, visitors, a house move or rearranged furniture all put cats off food, and cats are more sensitive to this than most owners expect.

And keep water available and appealing — several wide bowls away from food, changed daily.

What Not to Do

Two things specifically.

Do not wait it out. Whatever works with a dog does not apply here. Twenty-four to forty-eight hours without food is the threshold, and it is shorter for kittens and for diabetic cats.

Do not give human medication. Nothing from a human medicine cabinet is safe for a cat — paracetamol in particular is highly toxic to cats even in small amounts. Anti-nausea and appetite-stimulating medications for cats exist and work well, and they come from a vet.

Do not force-feed unless your vet has shown you how. Done wrongly it risks aspiration and it can create a lasting food aversion.

Do not offer a long parade of new foods. A cat that feels nauseous and is offered five things in a day can develop an aversion to all five, including foods you will want it to eat later.

Do not assume it is fussiness in an older cat. Reduced appetite is one of the earliest signals of illness in cats over ten — the checks are in senior cat health checklist and the wider routine in how to care for a senior cat.

Kittens and Older Cats Need Faster Action

The time limits at the top of this page are for healthy adults. Two groups need a shorter fuse.

Kittens have almost no reserves. A young kitten that refuses food for more than about twelve hours needs to be seen, and a very young one sooner. They also dehydrate quickly, so a kitten that is off both food and water is more urgent again. Upper respiratory infection is a very common cause in kittens, and a blocked nose stops a kitten smelling food at all — which stops it eating.

Older cats hide illness well, and a reduced appetite is frequently the first and only sign. In a cat over ten, going off food is a symptom until proven otherwise, and "she's just getting fussy in her old age" is the explanation that delays diagnosis most often.

The conditions behind it in older cats — kidney disease, dental disease, hyperthyroidism and pain — are all common, all findable with a straightforward examination and blood test, and all manageable. That is precisely why the visit is worth making early rather than late.

Diabetic cats on insulin are a separate case. A diabetic cat that will not eat but has been given insulin can become hypoglycaemic, which is an emergency. Contact your vet the same day.

And cats already known to have a chronic condition should be discussed with the vet as soon as appetite drops, rather than waiting the standard 24 to 48 hours.

When It Really Is Preference

Some cats genuinely are difficult, and it is worth separating that from illness.

The distinguishing feature: a fussy cat is otherwise completely well — bright, active, normal weight, normal drinking, normal litter tray — and it eats something enthusiastically, just not the thing you are offering.

A cat that is off all food, including favorites, is not fussy.

Common preference causes: a recent food change made too quickly, a texture the cat dislikes, food served cold, a bowl it finds uncomfortable, or a strong early-life preference that has never shifted.

Cats form food preferences young, and a cat raised on one texture often refuses others as an adult. That is why kittens benefit from being offered variety.

The fix for genuine fussiness is a slow, patient transition rather than a standoff — the method is in how to switch cat food safely, and the specifics of picky eaters in canned food for picky cats.

And check the portion is right. A cat picking at food may simply be full, particularly if someone else in the household is also feeding it or the portion was calculated for a heavier cat — the figures are in how much wet food to feed a cat.

What the Vet Will Want to Know

Preparing this makes the appointment far more useful.

Exactly how long since the cat last ate properly, and how much.

Whether it is refusing everything or only certain foods.

Whether it approaches food and then turns away, which points at nausea or mouth pain.

Weight, and whether it has changed. A home log is genuinely valuable here.

Drinking, and whether it has increased.

Litter tray — volume, frequency, diarrhea, straining, blood.

Vomiting, how often and what it looks like.

Any other changes — hiding, reduced grooming, vocalising at night, reluctance to jump.

Recent changes in the household, including new pets, building work or a move.

And any medication the cat is on, including flea and worming products.

Frequently Asked Questions

How long can a cat go without eating?

Not long safely. A cat that has eaten nothing for 24 to 48 hours needs veterinary attention, because fasting can trigger hepatic lipidosis, a serious liver condition. Kittens and diabetic cats need attention sooner.

Why does my cat sniff its food and walk away?

That specific pattern usually indicates nausea or mouth pain rather than fussiness — the cat wants to eat but something makes it unpleasant. Dental disease, kidney disease and gastrointestinal problems are common causes, and it warrants a vet visit.

Will my cat eventually eat if I just wait?

Possibly, but it is not a safe strategy. Unlike dogs, cats are at real risk from going without food for a couple of days, and waiting also delays finding the underlying cause.

Why has my cat suddenly stopped eating its usual food?

Check the food first — dry food goes rancid as the fat coating degrades, and cats detect this well before people do. If the food is fine, a sudden refusal of a long-accepted food is more likely medical than behavioral.

What can I do to get my cat to eat?

Warm the food slightly to lift the smell, use a wide shallow bowl, move it away from the litter tray and noisy appliances, offer small fresh portions often, and try something strongly smelling. If nothing works within a day, call your vet.

Is it normal for a cat to skip a meal?

Skipping one meal while otherwise bright and behaving normally is common and usually nothing. A full day with nothing at all, or any refusal alongside vomiting, hiding or lethargy, is not.

With a cat that will not eat, the clock matters more than the diagnosis. Twenty-four to forty-eight hours with nothing is the point at which this stops being a feeding problem and becomes a medical one, because cats do not tolerate fasting the way dogs do. In the meantime, warm the food, use a wide shallow bowl, move it somewhere quiet, and offer small fresh portions of something the cat has always liked — anything eaten beats holding out for the right thing. If the portion itself may be part of the picture, check it with the free cat food calculator.