Why Has My Cat Stopped Eating?

When a dog skips a meal, many owners watch and wait.

When a cat stops eating, we take it more seriously.

Cats are different.

A sudden loss of appetite can be caused by something relatively simple, such as stress, a food change or dental discomfort.

But it can also be an early sign of illness.

And unlike dogs, cats that stop eating for too long can develop a serious condition called hepatic lipidosis, or fatty liver disease.

Cornell University’s Feline Health Center warns that a sustained loss of appetite can seriously affect an adult cat in as little as 24 hours.

So if your cat suddenly stops eating, the important question is not simply:

“How do I get them to eat?”

It is:

“Why have they stopped?”

Is it normal for a cat to skip a meal?

A healthy cat may occasionally eat less than usual.

That can happen if:

• the weather is hot
• they have eaten somewhere else
• there has been a change in routine
• they dislike a new food
• they are mildly stressed
• they have recently had a large meal

But a cat that completely refuses food, particularly for a full day, deserves attention.

VCA recommends veterinary assessment if a cat has not eaten properly for around 24 hours because cats are particularly susceptible to complications from prolonged food refusal.

The longer the appetite loss continues, the more important it becomes to find the cause.

Why has my cat stopped eating?

There are many possibilities.

Some are behavioural.

Some are dietary.

Some are medical.

Common causes include:

• dental pain
• gastrointestinal upset
• kidney disease
• pancreatitis
• liver disease
• infection or fever
• intestinal blockage
• constipation
• stress
• environmental changes
• food aversion
• pain elsewhere in the body

Cornell lists conditions including kidney disease, diabetes, pancreatitis, hyperthyroidism and hepatic lipidosis among the many health problems that may cause loss of appetite in cats.

That does not mean every cat that misses dinner has a serious disease.

But persistent appetite loss is a symptom, not a diagnosis.

First question: has your cat actually stopped eating?

In multi-cat households, this isn't always obvious.

You may put food down and see empty bowls later.

But which cat ate it?

If you suspect one cat has stopped eating, feed them separately so you can measure what they actually consume.

Look at:

• how much food is offered
• how much remains
• whether the cat approaches the bowl
• whether they sniff the food and walk away
• whether they try to eat but stop
• whether they chew strangely
• whether food falls from their mouth

Those behaviours can provide useful clues.

A cat that seems hungry but cannot comfortably eat may have a very different problem from a cat that has no interest in food at all.

Dental pain is easy to miss

Dental disease is one of the first things worth considering.

Cats can have significant dental pain while still appearing relatively normal.

A cat may:

• approach the bowl
• sniff the food
• take a bite
• drop it
• chew on one side
• prefer soft food
• stop eating altogether

Cornell specifically notes that pain from dental disease is a common reason cats refuse food.

This is also why simply changing flavours repeatedly may not solve the problem.

The issue may not be the food.

Eating itself may hurt.

Could the food be the problem?

Yes.

Cats can be surprisingly particular about food.

They may reject a meal because:

• the recipe changed
• the texture changed
• the food smells different
• the food is stale
• the bowl is dirty
• the food is too cold
• a new food was introduced too quickly

Some cats become highly attached to particular textures and aromas.

This is especially relevant when changing from:

• wet to dry
• dry to wet
• pâté to chunks
• one protein source to another

But if a cat that normally eats enthusiastically suddenly refuses a familiar food, do not assume they have simply become fussy.

A sudden behavioural change deserves closer attention.

Stress can reduce appetite

Cats are highly sensitive to environmental change.

Possible triggers include:

• moving house
• a new baby
• a new pet
• visitors
• renovation
• boarding
• another cat entering their territory
• changes to litter trays or feeding locations
• the loss of another animal

Cornell notes that psychological and environmental stress can contribute to food refusal in cats.

For some cats, moving the food bowl away from a noisy area or separating feeding stations may help.

But stress should not automatically be blamed when appetite loss persists.

Medical causes still need to be considered.

Why not eating is more dangerous for cats

This is the part many owners do not realise.

When a cat stops eating, its body begins using stored fat for energy.

Large amounts of fat are mobilised and sent to the liver.

In some cats, the liver cannot process that fat efficiently.

Fat begins accumulating inside liver cells.

This condition is called hepatic lipidosis, commonly known as fatty liver disease.

It can become life-threatening.

Overweight and obese cats are at particularly high risk, although the condition can occur in cats of different ages and body conditions. Cornell reports that hepatic lipidosis is usually associated with an underlying illness or other cause of prolonged food refusal.

VCA notes that fatty liver disease often develops after several days of little or no food intake and is especially common in overweight cats.

This is why the advice for cats is different from simply:

“They'll eat when they're hungry.”

Sometimes they won't.

And waiting too long can make the situation significantly more complicated.

Overweight cats deserve extra caution

This connects directly to another issue we regularly see.

An overweight cat suddenly stopping eating can be particularly concerning.

It may seem logical to think:

“They have plenty of weight to lose.”

But rapid fat mobilisation is exactly what can contribute to hepatic lipidosis.

An overweight cat should lose weight in a controlled way, not through sudden starvation.

If your overweight cat suddenly refuses food, do not view it as an accidental weight-loss opportunity.

Find out why.

What if my cat is still eating a little?

Reduced appetite matters too.

A cat does not have to stop eating completely for something to be wrong.

You might notice:

• eating half the usual amount
• taking much longer to finish meals
• walking away repeatedly
• refusing favourite foods
• only licking gravy from wet food
• eating treats but ignoring meals

That is useful information.

Measure what the cat is actually consuming rather than relying on impressions.

If the decline continues, veterinary advice is appropriate.

Look at the whole cat

Appetite should never be assessed in isolation.

Ask:

Are they drinking normally?

Are they urinating normally?

Are they vomiting?

Do they have diarrhoea?

Are they hiding?

Are they losing weight?

Are they grooming?

Are they moving normally?

Are they using the litter tray?

Loss of appetite alongside lethargy, vomiting, diarrhoea, weight loss, dehydration or unusual behaviour is more concerning.

Greencross lists loss of appetite among the common signs associated with gastrointestinal disease and advises seeking veterinary attention when pets are sick, dehydrated or behaving unusually.

Cats hide illness remarkably well

One of the challenges with cats is that they can be extremely good at hiding discomfort.

A dog may make it very obvious that something is wrong.

Cats often become quieter.

They sleep more.

They hide.

They stop interacting.

They may simply stop finishing their food.

That subtle change may be one of the first signs an owner notices.

So appetite is useful information.

If your normally enthusiastic eater suddenly loses interest, pay attention.

What about kidney disease?

Kidney disease is one important cause of reduced appetite, particularly in older cats.

Cats with kidney problems can experience nausea and feel generally unwell.

They may also drink and urinate more than normal.

VCA notes that cats with kidney or liver disease may lose their appetite while also showing increased thirst.

Again, appetite loss alone does not diagnose kidney disease.

But in an older cat, particularly one drinking more or losing weight, it deserves investigation.

What about pancreatitis?

Pancreatitis can also cause cats to eat less or stop eating.

Unlike some dogs, cats with pancreatitis may not display dramatic vomiting or obvious abdominal pain.

The signs can be vague.

They may simply:

• eat less
• become lethargic
• hide
• lose weight

This is another reason persistent appetite loss should not automatically be labelled fussiness.

Could something be blocking the intestines?

Cats sometimes swallow things they shouldn't.

String.

Ribbon.

Thread.

Hair ties.

Elastic bands.

Small toys.

A gastrointestinal foreign body can cause:

• appetite loss
• vomiting
• abdominal pain
• lethargy
• changes in bowel movements

This can become an emergency.

If you suspect your cat has swallowed string or another foreign object, seek veterinary advice promptly rather than attempting to solve the problem through diet.

Should you force-feed a cat?

Generally, no.

Force-feeding a cat at home can create several problems.

It may:

• increase food aversion
• create significant stress
• lead to aspiration if food enters the airway

VCA specifically cautions against force-feeding cats because it can worsen food aversion and create a risk of aspiration pneumonia.

If a cat genuinely requires nutritional support, veterinarians have safer methods available, including feeding tubes where appropriate.

A feeding tube can sound extreme to owners.

In reality, in some circumstances it can be one of the safest ways to support a cat while the underlying problem is treated.

Can you tempt a cat to eat?

If your cat has only recently become reluctant to eat and otherwise appears normal, some simple steps may help while you monitor them.

You can try:

• offering fresh food
• warming wet food slightly to increase aroma
• using a clean bowl
• moving the feeding area somewhere quiet
• offering smaller meals
• separating the cat from other pets during feeding

But these techniques should not become a way of repeatedly postponing veterinary care.

If the cat continues refusing food, the goal should shift from:

“Which flavour will finally tempt them?”

to:

“What is causing this?”

Don't keep changing foods endlessly

When a cat refuses one meal, owners understandably try something else.

Then something else.

Then another brand.

Then tuna.

Then chicken.

Then treats.

That can sometimes encourage eating.

But it can also make it difficult to understand what is happening and can create additional gastrointestinal disturbance.

If a cat suddenly stops eating a food they have tolerated well for months or years, there may be something else going on.

When should I take my cat to the vet?

A good practical rule is:

If your adult cat has eaten little or nothing for around 24 hours, contact your veterinarian.

Do not wait several days hoping hunger will eventually win.

Cornell warns that appetite loss can significantly affect an adult cat within about 24 hours, while VCA similarly recommends prompt veterinary attention when a cat has not eaten properly for a day.

Seek help sooner if your cat is also:

• repeatedly vomiting
• extremely lethargic
• weak
• having difficulty breathing
• showing obvious pain
• unable to keep water down
• jaundiced
• straining in the litter tray
• suspected of swallowing a foreign object
• suspected of ingesting a toxin

Very young kittens also require much faster attention.

Cornell notes that a kitten younger than six weeks may be at serious risk after as little as 12 hours without food.

What role does nutrition play?

Appropriate nutrition absolutely matters.

Cats have specific nutritional requirements that differ considerably from dogs.

They require complete and balanced food containing appropriate levels of:

• animal-derived protein
• essential amino acids
• taurine
• fats
• vitamins
• minerals

But when a cat suddenly stops eating, nutrition is only one part of the investigation.

The most nutritionally impressive food in the world provides no benefit if the cat refuses to eat it.

At Pet Food Australia, we believe the cat in front of you should always guide the conversation.

Watch:

• appetite
• weight
• body condition
• stools
• hydration
• coat
• behaviour
• litter-box habits

Changes matter.

The important distinction: fussy or unwell?

Some cats genuinely are selective eaters.

But there is a difference between a cat that has always been particular and one that suddenly changes behaviour.

A lifelong fussy cat that rejects one flavour but happily eats another may simply have preferences.

A cat that normally runs to the bowl and suddenly turns away deserves much closer attention.

Change is often more informative than the behaviour itself.

Know what is normal for your cat.

Then notice when normal changes.

The bottom line

A cat skipping part of one meal is not automatically an emergency.

But cats should not go prolonged periods without eating.

If your cat suddenly stops eating:

Confirm how much they are actually eating.

Look for other behavioural or physical changes.

Check whether they appear interested in food but unable to eat.

Do not force-feed them.

And if they have eaten little or nothing for around 24 hours, contact your veterinarian.

For cats, appetite is much more than an indication of whether they like tonight's dinner.

It can be one of the earliest signals that something isn't right.

When a cat that normally eats suddenly stops, don't just change the food. Ask why.