My cat won't eat: causes, home care & when to call the vet
A plain-English guide to not eating in cats — what\'s usually fine, what isn\'t, and what to do today.
Cats refusing food is much more serious than dogs refusing food. A healthy adult cat going more than 24 hours without eating is at real risk of hepatic lipidosis — a life-threatening liver condition where the body, deprived of food, mobilises fat into the liver faster than the liver can process it. Overweight cats are at the highest risk.
That changes the math. Where a dog can safely skip a meal or two, a cat off food for a day needs a vet call. Two days is no longer optional. Three days is an emergency.
Cats are also expert at hiding illness. By the time appetite drops noticeably, the cat may have been quietly unwell for some time. Note exactly how long it has been since they ate normally, whether they're drinking, whether they're using the tray, and any other change in behaviour — hiding, grooming less, sitting in unusual positions.
Common causes
Stress or environmental change
Monitor at homeNew furniture, new pet, builders, owner travel. Common but should not last more than 24–48 hours.
Food fussiness / new food
Monitor at homeCats imprint on food types early. A sudden switch in texture, brand, or temperature can cause refusal.
Dental disease
See a vet within 24–48 hoursResorptive lesions, tooth root abscesses, stomatitis. Cat may approach the bowl and walk away, or eat only soft food.
Read more about dental disease →Kidney disease
See a vet within 24–48 hoursSenior cats. Appetite waxes and wanes, paired with increased thirst, weight loss, sometimes vomiting.
Read more about kidney disease →Hyperthyroidism
See a vet within 24–48 hoursCounter-intuitively, very advanced hyperthyroidism can cause appetite loss after long-running ravenous appetite.
Read more about hyperthyroidism →Pancreatitis
See a vet within 24–48 hoursSubtle in cats — appetite loss, lethargy, sometimes vomiting. Specific blood test needed.
Read more about pancreatitis →Hepatic lipidosis
Emergency — vet nowThe dangerous downstream consequence of any cat off food for several days. Jaundice, severe lethargy, drooling. Needs aggressive nutritional support, often via feeding tube.
Foreign body
Emergency — vet nowEspecially string, ribbon, hair ties. Cat may drool, paw at mouth, vomit, refuse food.
What you can safely do at home
- Offer the regular food, warmed slightly to release aroma.
- Try strong-smelling foods cats often accept: tuna in water (small amount only), warmed wet food, plain cooked chicken.
- Hand-offer a small piece of food at nose height to see if the cat is interested but unable to eat (dental pain).
- Check the mouth gently for redness, broken teeth, or string under the tongue.
- Confirm water intake — a cat off both food and water for 12+ hours is already a same-day vet visit.
- Do not wait a full 48 hours; the hepatic-lipidosis window is shorter than that.
These steps are general guidance for an otherwise well, healthy adult pet. If your cat is a puppy/kitten, a senior, or has a known chronic condition, call a vet rather than waiting it out.
What to expect at the vet
The vet will usually:
- Full physical exam, including thorough oral exam (often needs light sedation in painful cats)
- Bloodwork including liver values, kidney values, T4 thyroid, and feline pancreatic lipase
- Urinalysis
- Abdominal imaging if foreign body or organ disease is suspected
- Appetite-stimulant medication (mirtazapine, capromorelin); feeding tube placement if at risk of hepatic lipidosis
Useful questions to ask:
- Is this dental, kidney, thyroid, pancreatic, or behavioural?
- How urgent is restoring nutrition — do we need an appetite stimulant or feeding tube?
- Should we do a dental check under sedation?
- What signs would mean hepatic lipidosis is developing?
How to reduce the chance of it happening again
- Feed on a consistent schedule; you'll spot drops faster.
- Annual dental check, with cleaning under anaesthesia when indicated.
- Annual senior wellness panel from age 7; twice yearly from age 12.
- Maintain a stable environment; introduce changes (new pet, new home) gradually.
- Never let an overweight cat go on a sudden crash diet — this is the most common trigger of hepatic lipidosis.
Frequently asked questions
How long can a cat go without food?
A healthy cat can technically survive several days, but the risk of hepatic lipidosis begins climbing after 24 hours and becomes serious within 48–72. Treat any cat off food for 24 hours as needing a vet call.
What is hepatic lipidosis, and why does it matter so much?
It is fatty liver disease that develops when a cat — especially an overweight one — goes without food. The liver becomes overwhelmed by mobilised fat, leading to jaundice, severe lethargy, and liver failure. It needs aggressive treatment, often with a feeding tube, and is one of the strongest reasons cats with appetite loss can't be managed with "wait and see."
My cat is eating less but not nothing — is that ok?
A persistent reduction below normal intake for more than a few days, especially with weight loss, warrants a vet exam. Bloodwork and a dental check are usually first steps.
Can I tempt my cat with tuna or human food?
Tuna in water occasionally is fine to entice an inappetent cat for a meal or two, but it's not balanced nutrition. Don't use tuna in oil, brine, or with onion/garlic. Plain cooked chicken is safer for repeat offers.
My cat had dental work and now won't eat — normal?
A day of soft food and reluctance is normal after extractions. Refusal beyond 24 hours, drooling, or pawing at the mouth needs a call back to the practice that did the work.