Cats hide illness until they can't. This is the plain-language guide to telling the difference between "watch overnight" and "go now" — written for the moment you're standing in the hallway at 2am, not sure.
No account. No paywall on anything urgent.
If any of these are happening, stop reading and get to an emergency vet. Nothing on this site is worth the time it would cost you.
Especially in male cats. Repeated trips to the litter box, crying in it, or straining with little or no urine.
Why it can't wait: a urethral obstruction blocks the bladder entirely. It can become fatal in roughly 24–48 hours.
Panting, laboured belly breathing, neck stretched out, or blue/grey gums.
Why it can't wait: unlike dogs, healthy cats don't pant. Keep them calm — stress alone can worsen it — and go.
Lilies (any part, including pollen and vase water), antifreeze, acetaminophen, ibuprofen, or unknown pills.
Why it can't wait: lilies cause acute kidney failure; acetaminophen is lethal to cats in tiny doses. Go even if they seem fine.
Dragging back legs, crying with cold or pale back paws, unresponsiveness.
Why it can't wait: sudden hind-limb weakness can indicate a clot, which is intensely painful and time-critical.
Especially in an overweight cat, and especially alongside hiding or vomiting.
Why it matters: cats that stop eating can develop hepatic lipidosis. This one isn't a 2am dash, but it isn't "wait and see" either.
Sick Cat Survival is an educational resource, not a veterinary practice. Nothing here is a diagnosis, and nothing here replaces an examination by a licensed veterinarian. We don't know your cat.
If you are unsure, call a vet. An unnecessary call costs you a few minutes; the other mistake costs more. For suspected poisoning, the ASPCA Animal Poison Control Center is (888) 426-4435 and is staffed around the clock — a consultation fee may apply.
This site got built because of these two. Every guide here started as a question asked at the wrong hour, with a cat behaving slightly wrong and no clear way to tell whether it mattered.
So the rule for this site is simple: the things that could kill your cat tonight are free and at the top of the page. No email wall, no account, no "unlock." If you're in the bad moment right now, take what you need and go.
The paid side is everything that comes after — the chronic conditions, the home monitoring, the questions you want answered before the next 2am.
The emergency guidance stays free forever. Membership is for the long tail — the chronic illness you're managing, the monitoring you're doing at home, and keeping this site running.
Support the free guides, get the basics.
For a cat you're actively caring for.
For chronic conditions and long roads.
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