Cat Not Eating? When to See the Vet and What to Try at Home

Pickiness, or a real problem?

You can’t usually tell pickiness from illness by looking at the bowl. Vets split it into two patterns. One is a cat eating less than usual, picking at food and leaving some. The other is a cat eating nothing at all, called anorexia. A cat eating nothing is on a much shorter clock: after a full day without food, they need attention whatever the reason.

If your cat is eating less rather than nothing, look at the rest of the cat. A genuinely picky cat is otherwise normal: bright, interested in what’s going on, and usually still keen on treats or a different food. Be careful with treats, though. Plenty of unwell cats still take a treat, especially early on, so a cat that eats a snack but refuses meals isn’t in the clear.

A cat that is off their food because something is wrong usually shows other changes, even small ones:

• Hiding more, sleeping more, grooming less, or sitting hunched
• Bad breath, drooling, or pawing at the mouth
• Losing weight, vomiting, or using the litter box differently

Look at the whole cat, not just the bowl.

When to see the vet

A healthy adult cat that has eaten nothing for around 24 hours should see a vet. A cat that is still eating but leaving most of each meal should be checked if things don’t improve within a day or two. Overweight cats and cats that are already ill should go sooner.

Kittens are more urgent still: they can become dangerously weak within hours, so a kitten that isn’t eating needs a vet the same day. A cat with diabetes or kidney disease that stops eating also needs prompt care, because for them a missed meal is not a small thing.

Some signs mean going straight away, to an emergency clinic if your vet is closed:

• Fast or laboured breathing
• Collapse or marked weakness
• Yellow gums or yellow whites of the eyes
• Repeated vomiting
• Straining in the litter box and passing little or no urine, especially in a male cat (this can be a life-threatening blockage)

These need a vet the same day, though not necessarily a midnight dash:

• Diarrhea
• Hiding away
• Drooling or pawing at the mouth
• Noticeable weight loss
• Signs of dehydration, such as not drinking, tacky gums, or sunken eyes

A cat that hasn’t eaten for a day but is otherwise bright can usually wait for your own vet to open. If you’re unsure, call. It costs you very little.

Why a cat not eating is so urgent

Cats cope badly without food because of hepatic lipidosis, or fatty liver. When a cat stops eating, the body pulls stored fat out to use as fuel, but in cats the fat reaches the liver faster than the liver can handle it. Liver cells fill with fat and the liver stops working properly. Untreated, it is often fatal.

Fatty liver can start after just a few days of a cat eating little or nothing, which is exactly when many owners are still thinking “let’s give it another day.” Overweight cats carry more fat and are at much higher risk, so a few skipped meals can be dangerous for them. If you’re not sure whether your cat is overweight, our cat body condition guide shows how to check.

There’s one more reason not to wait. Appetite loss is usually a symptom, with an illness behind it, and fatty liver often develops on top of that illness. Waiting for the appetite to come back risks fatty liver and also delays finding the real cause.

What you can do at home

At home you can coax a cat who is mildly off their food to eat a bit more, or keep some calories going in while you wait to see the vet. It doesn’t replace the visit. If your cat has eaten nothing for a day, shows any emergency signs, or is a kitten, overweight, or already ill, the most useful thing to do is contact your vet.

For a cat that is still eating, just not well, try these:

• Warm wet food to about body temperature. Cats decide a lot by smell, and warm food smells stronger than food straight from the fridge
• Offer something more aromatic, such as a little plain cooked chicken, a meat-based wet food, or their usual favourite
• Put the bowl somewhere quiet, away from the litter box, other pets, and household traffic
• Use a clean, shallow dish that doesn’t squash their whiskers
• Keep fresh water close by, since a cat that stops eating wet food loses a big share of their water too

Keep any human food plain. Many broths, deli meats, and baby foods contain onion or garlic, which are toxic to cats, so stick to plain cooked chicken or fish with nothing added.

Hand-feeding is fine too. Put a little food on a fingertip or a spoon and let your cat decide whether to lick it.

A few things to avoid:

• Don’t take all the food away to wait the cat out
• Don’t keep switching foods, which can put a queasy cat off even more
• Don’t give human medicines or another pet’s leftover medication. Many human drugs are dangerous for cats, and medication should come from your vet
• Don’t assume a cat that refused food for a day will start again on their own

If these steps don’t get your cat eating normally again fairly quickly, it’s time to see the vet.

Why cats lose their appetite

Pain is often overlooked, and the mouth is the first place to look. Dental disease is very common in cats, and a cat with a sore tooth or inflamed gums may want to eat but find it hurts too much. Arthritis, an injury, or discomfort anywhere else can also put a cat off food.

A cat that feels sick goes off food much the way a person does. An upset stomach, inflammatory bowel disease, pancreatitis, constipation, or a swallowed object can all take the appetite away. A cat that is both not eating and vomiting needs particular attention.

In middle-aged and older cats, illness elsewhere in the body is behind many cases. Kidney disease, diabetes, liver disease, infections, and cancer can all start out looking like a cat that is simply eating less, which is why a vet will want to find out why a poor appetite is lasting.

Some causes are simpler. A blocked nose matters a lot: cats rely on smell to want food, so a cat with a stuffy nose from cat flu may not want to eat until they can breathe freely. Stress and change play a part too, such as a house move, a new pet or person, rearranged furniture, a dirty bowl, or a sudden switch of food. Some medications reduce appetite, and a cat may be quiet and off their food for a day or so after a vaccination. Still, none of these can be confirmed from the couch, so let your vet check.

What the vet will do

The vet starts by looking for the reason your cat isn’t eating. That usually means a full physical exam, including a careful look inside the mouth, then blood tests and often x-rays or an ultrasound. Treating the underlying problem is what really brings the appetite back.

While looking for the cause, the vet will also help stabilise your cat, for example by easing nausea and helping their appetite, and giving fluids to a dehydrated cat. These help a cat through the meantime but don’t replace finding the cause. A cat that hasn’t eaten for a longer stretch, or already has fatty liver, may need a feeding tube. That sounds drastic, but most cats cope with one well, it ends the daily struggle over food, and it is often what gets a cat with fatty liver through to a full recovery. The earlier treatment starts, the better cats tend to do.

Once the cause is dealt with, most cats go back to eating normally. If your cat tends to go off their food, whether from a chronic condition or a sensitive temperament, a few habits help. Weigh them regularly so a drop is caught early. Change foods gradually. Keep mealtimes and the feeding spot predictable so they can eat in peace.

How Furwise Can Help

A cat that is off their food is easy to misjudge, because the two things that matter most are the hardest to remember: how much they actually ate, and how long they’ve been eating less. In Furwise you can log each meal in grams and how much was left, and see how much your cat ate each day this week, instead of relying on a sense that they “seem to be eating less.” You can log weight too and see it charted, and note symptoms like vomiting or low energy. At the vet, open the log and you can say exactly when it started.

A cat that stops eating has less time than many owners think. Look at the whole cat, know the signs that mean a same-day visit, contact your vet once a full day has passed without food, and let them find the cause while it’s still easy to treat.

Frequently Asked Questions

How long can a cat safely go without eating? Less time than most owners expect. A healthy adult cat that has eaten nothing for around 24 hours should see a vet, and kittens, overweight cats, and cats with an existing illness should go sooner. A few days of eating little or nothing can start hepatic lipidosis (fatty liver), a serious liver disease. So after a full day of refusing food, contact your vet rather than waiting longer.

My cat won’t eat but seems otherwise fine. Should I still worry? Yes. A cat eating nothing is just as urgent when they look perfectly well, because fatty liver depends on whether they’re eating, not on how sick they look. A cat that is eating less but is bright, active, and keen on treats may just be fussy, but if reduced eating lasts more than a day or two, it’s still worth calling your vet.

Why is not eating more dangerous for cats than for dogs? It comes down to how a cat’s body handles fat. When a cat stops eating, fat reaches the liver faster than the liver can process it, and the liver fills with fat: hepatic lipidosis. Dogs don’t develop this nearly as readily, so a cat can’t safely skip meals until hungry, and a cat that isn’t eating should be taken seriously within days.

How do I get a sick cat to eat? Coax gently if your cat is only mildly off their food: warm wet food to about body temperature, offer something aromatic like plain cooked chicken, and use a clean, shallow dish in a quiet spot. Letting your cat lick food off your fingertip is fine. Don’t force food in with a syringe, which risks food entering the lungs, and don’t take food away to wait the cat out. If these don’t work fairly quickly, your cat needs a vet.

My cat stopped eating after I changed its food. Is that the cause? Possibly, since cats can be stubborn about a new food, but don’t jump to that conclusion. A cat that refuses the new food but happily eats the old one and treats is probably protesting the change. A cat that won’t eat anything, including old favourites, has something else going on, and the food change is just a coincidence. Either way, if your cat has eaten nothing for a whole day, take them in to be checked.

Can stress alone make a cat stop eating? Yes. A house move, a new pet or person, rearranged furniture, or a change in routine can all make a cat eat less for a short while. But many genuinely sick cats get written off as “just stressed” and miss out on care. Stress is a fair explanation only if your cat is eating normally again within a day or two. A cat you think is stressed who keeps eating poorly should see a vet.