Cat Not Eating: When It's Serious and When It Isn't
Dogs can go a couple of days without food with relatively little risk. Cats cannot. A cat that stops eating for more than about 24-36 hours is at risk of hepatic lipidosis — a potentially fatal liver condition triggered by rapid fat mobilisation. This is the single most important thing to know about feline appetite loss.
The timeline
Under 12 hours in an otherwise well cat: usually not urgent, watch it. 12-24 hours: worth a call to the vet, especially with other symptoms. Over 24 hours, or any duration with vomiting, lethargy, or hiding: treat as urgent.
| Situation | Action |
|---|---|
| Skipped one meal, acting normal | Monitor, offer food again in a few hours |
| 24 hours, otherwise well | Call vet same day |
| 24+ hours | Vet now |
| Any food refusal + vomiting | Vet now |
| Overweight cat refusing food | Vet now — higher lipidosis risk |
Why fat cats are at higher risk
Overweight cats mobilise fat quickly when they stop eating, and the liver can't process the volume. This is why vets are more alarmed by a fat cat not eating than a lean one — it inverts the usual intuition.
What to try before panicking
Warm the food slightly — aroma drives feline appetite more than taste. Try a strong-smelling wet food. Remove competition from other pets. Move the bowl away from litter and noise. Never withhold water.
Red flags that override everything
Open-mouth breathing, straining in the litter box, a distended abdomen, yellowing of the gums or ear whites, or complete unresponsiveness. These are same-hour emergencies, not watch-and-see.
The mistakes that cost people money
- Waiting 48 hours because the dog would be fine.
- Assuming a fat cat has more reserves — the opposite is true.
- Free-feeding through the refusal so you can't tell how much was eaten.
- Changing food abruptly during a refusal, which adds a second problem.
Common questions
How long can a cat safely go without food?
Roughly 24 hours in a healthy adult. Beyond that the risk of hepatic lipidosis rises quickly, and overweight cats are at greater risk.
Should I force-feed?
No. Forcing food risks aspiration. Ask the vet about appetite stimulants or assisted feeding.