Cat not eating: how long is too long, and when to see a vet

If your cat has stopped eating or is eating far less than usual, go to your vet now; if they are eating a little less than usual or picking at food, call your vet the same day. There is no window to wait out at home.

Signs that mean go to a vet now

Go to your vet or an emergency vet straight away, and call on the way, if your cat has any of these.

• A cat who stops eating, or eats far less than usual. Go now. The University of Sydney's vet hospital lists inappetence, which means a lack of appetite, among the signs of an emergency.
• Any drop in eating, even a little less, along with any other sign, including vomiting, diarrhoea or low energy. Go now. Vomiting, diarrhoea, difficulty breathing, collapse, or severe pain or distress are all on the University of Sydney's urgent or emergency lists, and a cat with any drop in eating on top of any of them, or on top of low energy, should be seen straight away.
• Difficulty breathing, or collapse. Go now. The University of Sydney's vet hospital lists both as emergencies.
• Severe pain or distress. Go now. The University of Sydney's vet hospital lists this among the signs that need urgent care.

If you are unsure whether it is an emergency, the University of Sydney's vet hospital puts it simply: it is always safest to bring your pet in.

Signs that mean call your vet today

Call your vet the same day if your cat has any of these.

• Eating a little less than usual, or picking at food, while otherwise bright and themselves. The PDSA says most cats graze throughout the day, so if that natural behaviour stops it is usually a sign that something is wrong, and to have your cat checked by your vet for any change in how they eat.
• A cat who is not eating as they normally would. International Cat Care says to contact your veterinary clinic.

The PDSA also lists these tell-tale signs that can come with a change in how they eat, and each is worth mentioning when you call:

• Weight loss.
• Drooling more than usual.
• A painful mouth, such as pawing at the mouth, hissing or backing away from a bowl, or chewing on only one side.
• Drinking more than usual.

How long is too long to wait?

If your cat has stopped eating or is eating far less than usual, go to your vet now; we will not give you a window to wait out at home. If they are eating a little less than usual, contact your vet the same day you notice it.

The PDSA says many different problems can be behind it. Only your vet can tell them apart. That is why how long is too long is not a number to wait for. It is a call.

Two veterinary sources give a time, and both point the same way. International Cat Care says many things can be behind a change like this, including illness and stress. It says even as little as three days of any drop in eating can have significant effects on a cat's health, so three days is an outer limit to go now, never a window. It adds that a cat with any drop in eating for three days or more should be seen urgently, which means go now.

Cornell University's feline health centre is more cautious again. It says a sustained loss of appetite can have a severe impact on a mature cat's health if it persists for as little as 24 hours, and that for a kitten younger than six weeks of age, going without for just 12 hours can pose a lethal threat, so go now, long before either limit. A vet there strongly encourages owners to consult a veterinarian immediately on noticing any signs of it; for a cat who has stopped eating, that means go now.

Reaching any of these outer limits means go now: a cat at 24 hours, a kitten under six weeks at 12 hours, or a cat with any drop in eating for three days or more. None of them is a window to wait out; if your cat has stopped eating or is eating far less, go now, before any limit is reached.

When to note it and watch

For a cat, this part is short and honest: nothing on this page is a sign to wait out at home. Every sign above is a call to your vet, as the tiers above set out. The note-taking is not a wait; it is what you do while you arrange the call.

Write down when your cat last ate normally, how much they are drinking, and anything else that changed. That way the call starts from facts rather than a general sense that something is off.

What to note for your vet

When something changes, these details help your vet see the whole picture:

• When they last ate normally, with the date and the time.
• How much they are drinking, and whether that has changed too.
• Weight, if you have a recent reading, with the date.
• Toileting and energy, in your own words.
• Vomiting, or anything else that appeared.
• Anything that changed around then, such as routine, other animals in the home, or something they might have eaten.

You do not need to work out what any of it means. That is your vet's job. Your part is the noticing.

How My Furly helps you keep track

My Furly is a place to keep your cat's health story, so the details are there when you call.

A dated entry as it happens. Add a dated entry each time you note your cat's eating and drinking. Symptoms sit on one timeline with vet visits, medicines and notes, so you can see when it started and whether it is changing.

Talk it through with Furly. Furly, the companion inside My Furly, knows your cat's own history. You can talk through what you have noticed, or ask how to put a question to your vet. Furly is not a vet, and is built to point you to one when it matters. It does not decide whether you should go, or how serious something is. You and your vet do.

A private link for your vet. When you choose to, you can create a private link with an access code and send it to your vet. They see your cat's timeline, vaccinations, weight and documents, so the conversation starts from the full picture. You stay in control, and you can replace the link at any time.

None of this replaces your vet, or a call to an emergency clinic. It means that when you do call, you have the answers to their first questions.

Frequently asked questions

How long can a cat go without eating before it is a problem?

Go to your vet now if your cat has stopped eating or is eating far less; call the same day if they are eating a little less. International Cat Care says even as little as three days of any drop in eating can have significant effects on a cat's health, and that three days or more should be seen urgently, so go now. Cornell University's feline health centre says a sustained loss of appetite can have a severe impact on a mature cat if it persists for as little as 24 hours, so go now, long before that. Reaching any of these outer limits means go now: a cat at 24 hours, a kitten under six weeks at 12 hours, or a cat with any drop in eating for three days or more. None of them is a window to wait out; if your cat has stopped eating or is eating far less, go now, before any limit is reached.

My cat is not eating but seems fine. Should I still call?

Yes: if your cat has stopped eating or is eating far less, go now, even if they seem fine. If they are eating a little less or picking at food while bright, call the same day. The PDSA says most cats graze throughout the day, so if that stops it is usually a sign that something is wrong, and to have your cat checked by your vet for any change in how they eat, so call the same day at the latest. International Cat Care says to contact your veterinary clinic if your cat is not eating as they normally would, so call the same day.

When should I go to an emergency vet?

Go straight away if your cat has stopped eating, is eating far less, or has any drop in eating alongside any other sign, such as vomiting, diarrhoea, low energy, difficulty breathing, collapse, or severe pain or distress. The University of Sydney's vet hospital lists a lack of appetite among the signs of an emergency.

Does my cat's age change how long is too long?

Cornell University's feline health centre says a sustained loss of appetite can have a severe impact on a mature cat's health if it persists for as little as 24 hours, and that for a kitten younger than six weeks, just 12 hours can pose a lethal threat, so go now, long before either limit. Whatever your cat's age, go now if they have stopped eating or are eating far less; call the same day if they are eating a little less.

What should I tell my vet if my cat is not eating?

Go now if your cat has stopped eating, and tell your vet when your cat last ate normally, how much they are drinking, whether they are toileting and behaving normally, and anything else that changed, including any recent weight with its date.

Sources

• The University of Sydney (University Veterinary Teaching Hospital). Signs of an emergency and FAQs. www.sydney.edu.au/vet-hospital/emergency/signs-and-symptoms-faqs.html. Accessed 19 October 2026.
• PDSA. My cat isn't eating. Published February 2020. www.pdsa.org.uk/pet-help-and-advice/pet-health-hub/symptoms/my-cats-not-eating. Accessed 19 October 2026.
• International Cat Care. How to encourage your cat to eat. Updated 28 November 2025. icatcare.org/articles/how-to-encourage-your-cat-to-eat. Accessed 19 October 2026.
• Cornell University College of Veterinary Medicine. Anorexia. www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/anorexia. Accessed 19 October 2026.

More on when to see a vet

For the full checklist of the signs that mean go now, call today, or note and watch, see When to take your dog to the vet: a calm checklist. For how weight fits into the picture, see Cat weight chart by age, and when weight loss needs a vet. For calmer ways to handle the worrying moments, see Never face the 3am worry about your pet alone.

Start keeping your cat's health history at myfurly.ai.

A gentle note

Furly helps you organise and understand your pet's history, and prepares you for the vet. It is not a diagnosis tool and does not replace professional care. If something worries you, speak to a licensed vet; if your cat stops eating, go now.