WagWatch
Cat not eating and lethargic: when to call the vet
A cat not eating and lethargic needs a vet today, and some signs mean an emergency clinic now. That is not our rule; it is what Cornell University’s veterinary college tells cat owners. What you can add is the record: the last meal, the last drink, the litter box, every vomit and every dose, with times. Here is what to watch for, what to write down while you arrange the call, and what your vet is likely to ask.
Key takeaways
- A cat not eating and lethargic needs a call to your vet today; Cornell’s emergency list includes lethargy, and some signs mean an emergency clinic now.
- A cat that stops eating can develop hepatic lipidosis, a fatty liver condition Cornell says can be fatal if not reversed promptly.
- Hiding and a drop in appetite are both on a veterinary list of behaviors that can point to pain. Tell your vet about both.
- Still drinking is no reason to wait, and a cat that has stopped drinking too needs the call promptly.
- Report facts with times: last meal, last drink, every vomit, the litter box, where she is hiding, every dose given or missed.
When is a cat not eating and lethargic an emergency versus wait-and-see?
It is never wait-and-see. The only question is which call: an emergency clinic now, or your own vet today.
Red flags: an emergency clinic now
Go to the nearest emergency clinic now if your cat:
- is unresponsive, or has collapsed;
- is having trouble breathing: breathing fast, or panting with her mouth open;
- has blue, purple or pale gums;
- strains in the litter box and passes little or no urine;
- may have swallowed a medication, antifreeze, any amount of a lily, or anything else poisonous;
- has a seizure or is trembling, loses her balance, or has trouble walking;
- keeps vomiting, or retches with nothing coming up;
- seems to be in pain, or her belly is swollen or painful.
Every sign above is on the emergency list of Cornell University’s animal hospital, which tells owners to go to the nearest emergency clinic immediately. Cornell’s Feline Health Center adds that a cat whose breathing is in question should get to a vet right away, that straining with little or no urine is “a true medical emergency”, and that with a suspected poisoning you should not try to make her vomit unless you are told to.
The same Cornell list includes lethargy or weakness. So a cat that is not eating and lethargic is a call to make now, not tomorrow: call your vet, and if they cannot see her today, or the clinic is closed, go to an emergency clinic.
Everything else: your vet, today
If nothing on that list fits, call your vet today, as soon as you notice she has stopped eating, and describe what you have seen. Cornell’s Feline Health Center strongly encourages owners to consult a vet immediately on noticing that a cat has stopped eating, and says not eating can have a severe impact on a mature cat’s health if it goes on for as little as 24 hours.
Write it down while you arrange the call
Note every refused meal, every drink you saw and every litter box visit, with times. When a partner or sitter shares care, “she hasn’t eaten much” is little help at the vet; “last ate half her dinner at 6 pm Sunday, refused breakfast” is. The full list is further down, with a log you can print.
How long can a cat go without eating before it becomes dangerous?
There is no number of hours to wait out. Cornell says a cat that stops eating is never simply deciding not to eat, and part of the danger is the fast itself:
When a cat stops eating, her body sends fat from its stores to the liver, more than the liver can process, and the fat collects in the liver cells. Cornell’s Feline Health Center calls this hepatic lipidosis, or fatty liver syndrome, and says it can be fatal if it is not reversed promptly. Cornell says it almost always comes with or after a cat’s nearly total avoidance of food, and that in more than 90 percent of cases it follows another condition, such as obesity, diabetes, cancer, hyperthyroidism, pancreatitis, kidney disease or another liver problem. It has been seen in cats from three months to 25 years old and of every body shape, and it seems much more common in obese cats. Cats with it can become reclusive, shy away from the food bowl, drool, and show a yellow tinge to the skin of the ears and to the gums.
So the length of the fast is something to report, not a clock to run: note the last meal she finished and the first one she refused.
Why cats are different
Cats, Cornell says, have a notable tendency to store fat in their liver cells, for reasons nobody yet knows. That is why “she’ll eat when she’s hungry” is no plan for a cat. And if her medication goes in with food, a refused meal can mean a missed or late dose too: your vet needs to know which.
Senior and chronically ill cats
The conditions Cornell names behind hepatic lipidosis include kidney disease, diabetes and hyperthyroidism, and it puts kidney disease alone at up to 40% of cats over 10 and 80% over 15. The call is the same for these cats: today. What changes is how much there is to tell, so log meals as they happen, even in a shared note or a sheet like our pet medication schedule template, and “she skipped breakfast” is a fact rather than a guess.
What does it mean if your cat is not eating and vomiting at the same time?
What it means is your vet’s question. What it means for you is a prompt call: Cornell’s Feline Health Center says a cat that vomits and also shows lethargy, weakness, decreased appetite, blood in the vomit, increased thirst, more or less urination, or diarrhea should be seen by a vet promptly. A cat not eating and lethargic already has two of those.
Count every episode
“Three times since 6 am” tells your vet more than “she threw up.” Note the time of each one, what came up (food, liquid, a hairball, anything with blood in it), and whether she ate or drank just before. A photo before you clean up helps.
When vomiting means an emergency clinic
Vomiting that keeps coming, or retching with nothing coming up, is on the emergency list above: go now. If a sitter saw the first episode and you saw the second, log both times in one place.
Why does it matter if a cat stops drinking as well as eating?
Because then nothing is coming in: Cornell’s page on hydration says a cat takes in water by drinking and from her food. It lists vomiting among the most common causes of dehydration, and lethargy, weakness, poor appetite and dry gums among its signs. Cornell’s advice: if you are concerned your cat is dehydrated, contact a vet promptly. At the clinic, it is addressed with fluids.
Leave the hydration check to your vet
Vets check the gums and the skin over the shoulders, and Cornell notes that an older cat’s skin can be slow to settle even when she is not dehydrated, so the reading belongs to the clinic. What you can bring is the time you last saw her drink.
If she has kidney disease, say so first
Cornell’s page on kidney disease says good hydration is essential for cats who have it, because dehydration can speed up damage to the kidneys. So start the call with the kidney disease and the time of her last drink, and make sure everyone who shares her care can answer that too.
What does hiding plus loss of appetite tell you about your cat’s condition?
Nothing you can read at home; to your vet, quite a lot. The International Society of Feline Medicine’s 2022 consensus guidelines on acute pain in cats, written for vets, list withdrawing or hiding among the behaviors suggestive of pain, along with decreased appetite, and note that painful cats generally do not eat. So mention both when you call.
Hiding and pain
The same guidelines warn that signs of pain in cats can be subtle and misread. Their list includes a hunched posture, lying quietly, a lack of interest in her surroundings and grooming less. Write down the ones you see rather than deciding what they mean.
What to note about where and how long
Write down the spot, when she was last seen in her usual places, and whether she ate, drank or used the litter box in between. If a partner or sitter saw her last, their times matter as much as yours.
What exactly should you observe and write down before calling the vet?
Your vet can only work with what you report, and “she seems off since maybe Tuesday” leaves them guessing. Six things take two minutes, so don’t let them hold up the call:
- The last meal she finished: what, how much, and when; then each meal she refused.
- The last time you saw her drink.
- Every vomit: the time, and what came up.
- The litter box: the last urine and the last stool, any straining.
- Where she has been: where she is hiding, and since when.
- Every medication dose given or missed, with the time.
The pre-vet observation log (printable)
Keep one sheet on the fridge, or one shared note, as the single record for everyone who looks after her. Each person writes a line in seconds: “7:40 am, ate half,” “2 pm, no pee in the box yet.” The times carry the information, not the adjectives: “skipped breakfast” tells your vet little; “last ate Monday 6 pm, refused Tuesday breakfast” tells them where to start.
Cat not eating: observation log
Go to the nearest emergency clinic now for: unresponsive or collapsed; trouble breathing; blue, purple or pale gums; straining with little or no urine; a possible poisoning; a seizure, trembling, loss of balance or trouble walking; vomiting that keeps coming, or retching with nothing coming up; pain, or a swollen or painful belly. Not eating and lethargic: call your vet today, and an emergency clinic if they cannot see her.
| Time, and who saw it | Food: what, and how much eaten | Water: saw her drink? | Litter box: pee, poop, straining | Vomiting: what came up | Where she was, what she did | Doses given or missed |
|---|---|---|---|---|---|---|
When three caregivers remember three different last meals
When a partner, a sitter and a walker all share care, each saw one slice of the day, and the pattern only exists across all of them. A shared log fixes that: one record, several hands, no arguments about whose memory is right, and it shows exactly which dose was missed. Bring the history to the vet instead of rebuilding it in the exam room.
What questions will your vet ask about a cat that stopped eating and became lethargic?
Expect questions like these: when did she last eat a full meal; any vomiting or diarrhea; is she drinking, and urinating more or less than usual; could she have got into medications, plants, string or antifreeze; what is she taking now. Cornell’s vomiting page names poisonous plants, human medications, string or yarn and antifreeze among the things cats swallow that make them vomit, and its page on poisons adds that lilies can cause life-threatening kidney failure in cats even in tiny amounts. If any of those is possible, that is the emergency call at the top of this page. Cornell also says the search for the cause of frequent vomiting begins with a thorough history from the owner. That history is your log.
Medication history questions for chronically ill cats
For a cat on daily medication, expect to be asked each one’s name and dose, when the last dose was given, and whether any were missed. Bring the bottles or a photo of the schedule: “something for her kidneys, mornings usually” costs time.
How do you track recovery after the vet visit without guessing?
Ask your vet what to watch for and when to call back, and write that down first. Then log what you logged before the visit, every day: appetite, water, the litter box, and whether each dose went in on time. “She ate a bit” is not a record; “ate half her breakfast, finished dinner, three days running” is what your vet needs on the recheck call. If anything on the emergency list appears, the call comes before the log.
What a shared log shows that memory cannot
You see dinner, the sitter sees breakfast, and nobody can say whether the appetite is coming back. With one shared log, whoever feeds or medicates logs it in seconds, and the pattern, and the proof that a course was finished, sit in one place.
Where WagWatch helps and where it does not
WagWatch keeps that shared daily log, free on every plan:
- Meals take All, Some or None, and every entry’s time can be set to when it happened.
- Vomiting and Loss of appetite are on a cat’s Medical list, Hiding and Extreme tiredness on her Behavior list, and a note on any entry holds the rest. There is no water counter, so the last drink goes in a note.
- Everyone in your household logs into the same record from their own phone or a browser, and every entry shows who logged it.
- At the clinic: the Vet report PDF, from History, lists your entries with their date, time and notes, free for the last 60 days; a share link Premium is a read-only page your vet opens without an account.
WagWatch does not say what any of it means, logging an entry alerts no one, and it cannot tell you whether today is an emergency. Act on the sections above first, and log afterwards.
Questions
My cat is not eating and lethargic but still drinking water. How long can I wait?
Don’t wait: call your vet today. Drinking does not change that, and Cornell’s emergency list includes lethargy or weakness, so if your vet cannot see her today, go to an emergency clinic. Meanwhile, write down the last meal she finished, the last drink you saw and every litter box visit.
Cat not eating and vomiting for 2 days: is this an emergency?
Call your vet or an emergency clinic now. Cornell says a cat that vomits and also shows lethargy, weakness or decreased appetite should be seen promptly, and its emergency list includes vomiting that keeps coming. Bring the count: how many times, when, and what came up.
Why is my senior cat not eating and hiding all of a sudden?
That is your vet’s question to answer, and it needs a call today. Cornell lists many conditions behind a loss of appetite, from kidney disease to dental pain, and a 2022 veterinary consensus on pain in cats lists hiding and a drop in appetite among the behaviors suggestive of pain. Note where she is hiding and since when.
Can a cat go 24 hours without eating?
Don’t plan on it. Cornell says not eating can have a severe impact on a mature cat’s health if it goes on for as little as 24 hours, and encourages owners to consult a vet immediately on noticing it. Call your vet today.
What should I tell the vet when my cat stopped eating and is lethargic?
Facts with times: the last meal she finished and how much of it, the last drink, how many times she vomited and what came up, the litter box, where she has been hiding, and every dose given or missed. Say, too, whether she could have got into a medication, a lily, antifreeze or string.
Sources
Every general statement about cats, appetite, hydration, pain and emergencies on this page comes from one of these veterinary sources. WagWatch is not connected to any of them.
- Anorexia, Cornell Feline Health Center, Cornell University College of Veterinary Medicine
- Hepatic Lipidosis, Cornell Feline Health Center
- Emergency and Critical Care, Cornell University Hospital for Animals
- Dyspnea (Difficulty Breathing), Cornell Feline Health Center
- Feline Lower Urinary Tract Disease, Cornell Feline Health Center
- Poisons, Cornell Feline Health Center
- Vomiting, Cornell Feline Health Center
- Hydration, Cornell Feline Health Center
- Chronic Kidney Disease, Cornell Feline Health Center
- 2022 ISFM Consensus Guidelines on the Management of Acute Pain in Cats, Steagall PV and others, Journal of Feline Medicine and Surgery, 2022
Not a substitute for your vet
WagWatch is a tracking and logging tool, not a veterinary service. Its job is to help you bring a clear, accurate history to the people who care for your pet professionally.
Log it in WagWatch
Print the log and put it by the food bowl, or add your cat in WagWatch and log the next meal, eaten or refused, with its time. If she has stopped eating today, make the call first and log afterwards.
Free to use every day, the whole log included. Premium adds the full history, photos on entries, vet share links, every pet and the AI assistant — $3.99 a month or $24.99 a year, with a 14-day free trial for new subscribers in the iPhone and Android apps. The cat page has more on what to log for a cat, shared households explains logging together, and the help pages cover logging and sharing with your vet. More posts are on the blog.