A cat that stops eating is a bigger deal than a dog that does — cats can develop a serious liver problem within days of not eating. This is one to act on sooner rather than later.
A cat not eating is more urgent than in dogs because cats can develop hepatic lipidosis (fatty liver), a dangerous condition, after just a few days without food. Causes range from stress and dental pain to illness. If a cat hasn't eaten in 24 hours — sooner if overweight or unwell — see a vet. Vets can treat the cause and prescribe an appetite stimulant.
Why a cat not eating is more urgent than a dog
This is the important difference most owners don't know: cats that stop eating can develop hepatic lipidosis (fatty liver), where the liver is overwhelmed processing body fat, and it can become serious within just a few days. So the "wait and see" window that's fine for a dog is not safe for a cat — especially an overweight one, which is counterintuitively at higher risk.
The clock: when to act
If a cat hasn't eaten in about 24 hours — sooner if it's overweight, a kitten, or otherwise unwell — call your vet. Don't extend that window hoping it passes. Appetite loss is often the first sign of a hidden illness, so it's worth taking seriously even when the cat seems otherwise okay.
When NOT to force-feed or guess
Do not use force-feeding or human appetite aids without veterinary direction — it's not the right approach and can cause aspiration or stress, and avoid assuming a picky cat is just being fussy when it's genuinely off food. The safe path is a vet, who can treat the cause and, when appropriate, prescribe an appetite stimulant like Entyce.
The picture
Appetite loss in a cat is a symptom, not a diagnosis — and because of the fatty-liver risk, it's one of the few "off" behaviors where waiting is genuinely risky. A vet finds what's behind it; supportive care and, if needed, an appetite stimulant get the cat eating while it recovers.
About Entyce (capromorelin): this is a prescription medication your veterinarian can prescribe. Read our guide, or ask us if you need help sourcing it.
Why it's urgent in cats
Cats that stop eating can develop hepatic lipidosis, where the liver is overwhelmed processing body fat. It can become serious within a few days, so don't wait as long as you might with a dog. [1]
Common causes
Stress or change, dental pain, nausea, infection, or organ disease. A hidden illness often shows up first as appetite loss.
How vets help
After finding the cause, a vet may prescribe an appetite stimulant such as capromorelin (Entyce) to get a cat eating while it recovers. Suitability and dose are veterinary decisions.
Frequently asked questions about cat not eating
How long can a cat go without eating?
Not long safely — around 24-48 hours warrants a vet, sooner if the cat is overweight or ill.
What is fatty liver in cats?
Hepatic lipidosis, a dangerous condition that can develop when a cat stops eating.
Related digestive & nausea guides
Dog Nausea · Dog Vomiting · Dog Vomiting And Diarrhea · Dog Throwing Up Blood · Dog Throwing Up White Foam · Dog Throwing Up Yellow
Sources & References
For educational use. PrepperPetSupply is a licensed, veterinarian-staffed pharmacy; prescriptions are dispensed only after review by a licensed veterinarian and are not a substitute for in-person veterinary care. Not for human use.