Cat not eating? How long is too long

"She'll eat when she's hungry" is advice written for dogs. For cats it is actively dangerous, because a cat's body responds to skipped meals in a way a dog's never does: within days of not eating, a cat starts shipping fat to her liver for energy, the liver can't cope, and the result, hepatic lipidosis, is a life-threatening disease all of its own. The fatter the cat, the faster it happens. So the question "how long do I wait?" has an answer measured in hours, and it helps to think of it as a clock.

Tonight: one skipped meal

A cat who ignores dinner but drinks, moves and behaves normally has earned some detective work, not a car ride. Warm the food a little, since smell is most of a cat's appetite. Offer something shameless: sardines, the good wet food. Try a flat dish, in a quiet spot, away from the other pets, and take rejected food away rather than leaving it to go stale, because a fresh offer works better than a sitting one. A cat with a snotty nose can't smell dinner at all; gently wiping her nose sometimes restarts the whole enterprise.

While you're at it, glance around: anything new in the house? New pet, new food, building work, a strange cat patrolling the garden? Stress is one of the commonest reasons cats go on hunger strike, and the cause is often visible from the kitchen window.

Tomorrow: the 24-hour line

A cat who has eaten nothing for a full day gets a vet call even if she seems fine. Not because disaster is certain, but because the things that stop cats eating are mostly invisible from the outside and mostly treatable when caught: dental pain (watch for the cat who approaches the bowl, wants it, then backs away), nausea from kidney or gut trouble, a respiratory bug that has stolen her sense of smell. You cannot tell these apart at home, and half of them turn around in a day with treatment.

The call is sooner than 24 hours if she is also hiding, vomiting, or flat; if she's a kitten or elderly, since small and old bodies carry no reserves; if she's also not drinking; or if she's straining or crying in the litter tray, which in a male cat is an emergency in its own right.

Day two and beyond: liver territory

Real lipidosis risk builds from around the second or third day of not eating, which is why the act-at-24-hours rule exists: it keeps you far from the edge rather than negotiating with it. And here is the counterintuitive part: the overweight cat, the one who looks like she could live off her reserves for a month, is the highest-risk animal on this page. Those reserves are exactly what floods the liver.

Two traps to skip. Don't try to starve a fussy cat onto a new food; with cats that game of chicken can end in liver disease, so if she refuses a new diet, go back to the old one and transition more slowly. And treats don't stop the clock: a cat living on Dreamies is still starving, just politely.

What the vet will ask

When she last definitely ate. What she's drinking. What the litter tray says. Any vomiting, any weight change, anything new at home. If you keep notes in Petus this is one tap of history: "barely touched dinner" logged in passing becomes data, three of those in a week becomes a pattern Petus flags rather than lets slide, and the timeline of when eating slowed rides along to the consult with her weight trend. The cat can't tell anyone what's wrong. The record can.