Why is my cat hiding? When "off" behavior needs a vet
Written by Dr. Cassie Knapp, DVM
Co-Founder & Chief Medical Officer, UrgentPaws
Published August 11, 2026
The short version
- Hiding is one of the few illness signals cats reliably give. A cat who suddenly withdraws to an unusual spot deserves attention, not privacy.
- A cat who has not eaten for 24 hours needs to be seen. Cats are uniquely vulnerable to a serious liver condition when they stop eating.
- Open-mouth breathing or panting in a cat is always an emergency, unlike in dogs.
- Subtle changes — grooming, litter box habits, where they sleep — are often the earliest and most useful clues.
Why hiding matters more in cats
Cats evolved as both predator and prey, and visible weakness carries a cost. The result is a species that conceals pain and illness remarkably well, often until a condition is well advanced. By the time a cat looks obviously unwell, they have usually felt unwell for some time.
This is why owners so often say the illness came on suddenly. Usually it did not — the signs were quiet. Hiding is one of the few that reliably breaks the surface.
Normal retreat versus a warning sign
Plenty of cats have a favorite wardrobe or a spot under the bed, and a cat withdrawing after houseguests, a new pet, or fireworks is behaving reasonably. What matters is change: a new location, a longer duration, or hiding paired with anything else on the list below.
Likely behavioral
- Location — Their usual spot
- Duration — Hours, easing as things settle
- Appetite — Eating normally once out
- Response to you — Emerges for food or attention
- Trigger — An obvious one — visitors, noise, a new pet
Warrants a vet visit
- Location — Somewhere new, tight, or hard to reach — under a bath, behind an appliance
- Duration — Most of a day or more
- Appetite — Skipping meals, or not drinking
- Response to you — Will not come out even for a favorite treat
- Trigger — Nothing has changed
The quieter signs worth noticing
- Not eating — 24 hours is the threshold at which we want to see a cat
- A coat that looks unkempt, or conversely over-grooming one particular area
- Sitting hunched with feet tucked and eyes half closed, rather than curled or stretched out
- Litter box changes: straining, going more or less often, or going outside the box
- Reluctance to jump, or sleeping somewhere lower than usual
- Bad breath, drooling, or eating on one side of the mouth
- Weight loss you notice when you lift them
Two of these are different in kind from the rest, and mean a 24-hour ER tonight rather than an appointment tomorrow. Open-mouth breathing or panting in a cat is not the benign thing it is in dogs — it suggests significant respiratory or cardiac trouble. And a male cat straining in the litter box with little urine may have a urinary blockage. Come to us or a 24-hour ER, whichever is closer — we can start treatment and transfer him.
Why a cat not eating is urgent
When a cat stops eating, the body mobilizes fat for energy, and the feline liver handles that influx poorly. Fat can accumulate in the liver and impair its function — hepatic lipidosis. Overweight cats are at particular risk, and it can develop after only a few days without food.
That is the reason we treat a cat who has not eaten differently from a dog in the same situation. A dog skipping a meal is often worth watching. A cat skipping meals for a day is worth a visit.
What a visit looks like
Vague signs need a broad first look, so we usually start with a full physical examination, then in-house bloodwork and a urine sample. That combination catches the common culprits behind a withdrawn cat: kidney disease, hyperthyroidism, diabetes, urinary disease, pain from arthritis or dental disease, and infection. Imaging follows if the picture points that way.
Bring specifics if you can — when they last ate, when you last saw them use the box, and any photographs or video of the posture that worried you. With a species this good at hiding things, your observations at home are often the most useful information we get.
Dr. Cassie Knapp, DVM
Co-Founder & Chief Medical Officer
Dr. Cassie Knapp is a veterinarian with 17 years of clinical experience and extensive emergency room and urgent care experience. See full bio
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