A door that closes on a cat does two things at once: it crushes tissue and it traps a panicking animal. The decisions that matter are made in the first 2 minutes, when you open the door or lift it off its hinges without pulling the cat, and in the first 2 hours, while swelling, nerve damage and internal bleeding can still be measured. On the way to the clinic, do not pull the trapped tail or limb, and do not give any human painkiller. The clock runs 0-1-2-6-24 hours.
Record three numbers before the cat leaves the house: breaths counted for 30 seconds and doubled, gum colour, and whether the tail lifts. A resting cat breathes 20-30 times a minute; over 40 with white gums is an emergency. A tail that stays limp while the bladder stays full is the same emergency with a 2-hour window, not a 24-hour one.
Why the window is 2 hours, not 2 days
Crush injury is not a bruise. Sustained pressure damages muscle fibres, and the fluid that leaks into a paw or a tail base raises pressure inside a closed space. That pressure collapses capillaries, so tissue downstream of the door loses oxygen while the skin still looks intact. Most vets want a crush injury seen within 2 hours, because swelling can be compared against a normal side and a limb that is losing circulation is far easier to save at hour 2 than at hour 12.
After 6 hours the picture gets quieter and more dangerous. Swelling peaks somewhere between 12 and 24 hours, the cat stops yelping and starts hiding, and an owner reads that calm as recovery. By 24 hours a fracture has set in the wrong position and a tail-pull injury has had a day to damage the bladder nerves.
The three injuries a door actually causes
Nearly every case is one of these, or two together. Naming the one you think you have changes the urgency.
| Injury | What you see | Numbers to record | Window |
|---|---|---|---|
| Crush and hematoma | Paw or tail swollen to twice its normal width, bruise showing after 12-24 hours | Circumference in cm, both sides, at a marked line | Exam within 2 hours; ice 10 minutes on, 10 off |
| Fracture or dislocation | Limb held up, no weight bearing, jaw that will not close, grating on gentle touch | Lameness 0-4, pain 1-5, toe pinch response | X-ray within 6 hours; bone heals in 4-6 weeks |
| Nerve or internal injury | Limp tail, dribbling urine, breathing over 40, pale gums, hard belly | Breaths per minute, urinations per 12 hours | Emergency, inside 2 hours |
| Nail bed or pad tear | Blood at one claw, licking a single toe, flinching on tile | 10 minutes of steady pressure, then recheck | Vet if bleeding continues past 10 minutes |
What to do in the first 10 minutes
Open the door by 2-3 cm and look before you widen it; if the cat is held on the hinge side, lift the door off instead of swinging it. Slide a folded towel under the body and lift the whole cat, not the trapped part. A cat in pain bites hard: wrap the body, cover the head.
Keep the cat warm: it runs at 38.0-39.2 C and loses heat fast in shock. A cold pack helps only on unbroken skin, wrapped in cloth, 10 minutes on and 10 off. Do not offer food or water; a cat that may need sedation should arrive empty.
Two things that make it worse
The first is pulling. A tail that is partly avulsed will finish the job if you yank it free, and a fracture that is merely cracked becomes displaced. If the door will not open, cut the hinge pin or take the door off; do not use the cat as a lever.
The second is a human painkiller. Ibuprofen, naproxen, aspirin and paracetamol are toxic to cats at a fraction of a tablet, and signs can start within 1-4 hours. There is no safe home dose. Pain relief is a vet decision, a prescribed NSAID or opioid given after the cat has been examined.
Tail-pull injury: the one that hides
When the tail is pulled or crushed at the base, the nerves running to the bladder and the anus stretch. The tail hangs and the base is sore. The dangerous part is urinary retention: the bladder overfills, the cat dribbles a few drops that look like urine output, and an overdistended bladder can rupture within 24-48 hours.
Count urinations in the litter box. Fewer than 1 in 12 hours after the injury, or a bladder you can feel as a firm ball the size of a plum, means the clinic now, not in the morning. Partial nerve recovery usually takes 2-6 weeks, some cats need the bladder expressed 3-4 times a day in the meantime, and a tail that turns dark and cold by day 7-10 is usually amputated.
The 6-hour swelling check
Mark the leg with a pen at a fixed point, measure the circumference with a soft tape, and write both numbers down. A 1 cm difference against the other side is normal after a crush; 2 cm or more, or a paw that is tight and shiny, needs a call back to the clinic the same day.
Swelling peaks in 12-24 hours, so hour 6 is a poor guide on its own; the useful signs at 6 hours are appetite, breathing rate and whether the cat will put the paw down. Keep it in one room, litter box and water within 2 metres, no jumping for 5-7 days, no stairs for 48 hours.
The 24-hour review
Head injuries declare themselves late: unequal pupils, walking into the doorframe, sleeping through a bowl of food. Check pupils every 2 hours for the first night if the head was caught. A jaw that will not close, drooling, or eating on one side is a fracture until proven otherwise.
Go back within 24 hours for any of these: a nail that is still bleeding after 10 minutes of pressure, a toe that is swollen and hot, a tail still without sensation, no stool in 48 hours, or a cat that has not eaten for 24 hours. Fever above 39.5 C means infection rather than inflammation.
Five steps for tonight
- Free the cat without pulling, wrap it in a towel, and put it in a carrier with the door shut.
- Count breaths for 30 seconds, look at the gums, and test whether the tail lifts.
- Call the clinic and say the words crush injury plus the number of hours since it happened.
- Photograph the injury next to a coin, then again at 6 hours.
- Withhold food, keep the cat warm, and write down every urination for 24 hours.
Deep cuts and embedded glass have their own rules; the trauma checklist and road accident triage apply the same 0-1-2-6-24 hour structure to bigger impacts.
Frequently asked
How long can a cat's crushed tail wait before a vet visit?
Two hours is the working limit. Crush injury raises pressure inside the tail base and can cut circulation, and if the nerves to the bladder are damaged the bladder overfills and can rupture within 24 to 48 hours. A tail that stays limp with fewer than one urination in twelve hours is an emergency, not a next-day appointment.
Can I give my cat ibuprofen after a door injury?
No. Ibuprofen, naproxen, aspirin and paracetamol are toxic to cats at a fraction of a tablet, with signs that can start within one to four hours, and there is no dose small enough to be safe at home. Pain relief has to come from a vet as a prescribed NSAID or opioid after the cat has been examined and weighed.
What if the cat seems fine an hour after the door closed on it?
Calm is not recovery. Swelling peaks between twelve and twenty-four hours, so a cat that hides and stops complaining at hour six may be worse rather than better. Measure the paw at a marked line, count resting breaths, and watch the litter box for twelve hours before you decide the cat is fine.