A cat that bit a live cord usually looks surprisingly normal in the first hour. The burns are small, the cat hides, and the real danger — pulmonary edema and arrhythmia — shows up 6 to 24 hours later. Cut the power, then treat the mouth as a burn that will get worse before it gets better.
What the current does on its way through
Household voltage is 120 V in North America and 220 to 240 V in most of Europe and Asia, at 50 or 60 Hz. A cat bites the cord with the corners of the mouth, so current enters at one lip and leaves at the other, crossing the tongue, palate and, in roughly 1 in 5 cases, the chest. At 120 V the injury is mostly local heat: 1 to 3 mm of charred tissue at each commissure. At 220 to 240 V the same bite delivers enough energy to throw the heart into ventricular fibrillation, and a cat can be dead within 30 seconds with almost no visible burn. Alternating current also tetanizes muscle, which is why the cat cannot let go: it clamps down until the cord is pulled away or the breaker trips.
Cut the power before you touch anything
Order matters more than speed. First unplug the appliance at the wall, or switch off the breaker. Only then touch the cat. Never grab a cat that may still be in contact with a live conductor — a wet mouth and wet paws conduct well, and 220 V across your hands is a cardiac risk for you. Do not use a wooden broom as a rescue tool; damp wood conducts. If you cannot reach the plug, turn off the circuit at the panel, which takes 10 to 20 seconds and removes the hazard completely. Once the circuit is dead, check breathing and pulse, and start compressions at 100 to 120 per minute if there is no heartbeat.
The mouth burn changes shape over 7 days
The wound you see on day 1 is not the final wound. Electrical burns cook tissue from the inside out, so the visible edge is smaller than the damage. Expect the eschar to slough between day 3 and day 7, leaving a defect 2 to 5 mm wider than it looked at first. The labial artery runs through the commissure, and when the slough separates around day 7 to 10 that vessel can open: sudden bleeding of 20 to 50 mL is the classic presentation. Keep the cat quiet, do not open the mouth to inspect it daily, and go in at once for any bleeding that does not stop in 5 minutes. About 1 in 3 cats need a small repair under anesthesia once the tissue declares itself, usually at day 7 to 14.
Twenty-four hours of heart and lung watch
Electric current irritates the myocardium and the pulmonary capillary bed. A cat can be discharged with a normal exam and develop both problems overnight. In hospital the checks are an ECG on arrival and again at 6 and 24 hours, oxygen saturation above 94%, and chest films at 6 to 12 hours because edema takes that long to appear. At home the watch is simpler and just as strict.
| Hour | What to check | Go back if |
|---|---|---|
| 0-2 | Breathing, gum color, ability to swallow | Open-mouth breathing or gray gums |
| 2-6 | Resting respiratory rate, twice | Above 40 per minute at rest |
| 6-12 | Rate, effort, cough, appetite | Cough or a rate rising by 10+ |
| 12-24 | Rate, gum color, collapse, hind-leg weakness | Any fainting spell or weakness |
| Day 3-10 | Mouth wound, bleeding, drooling, refusal to eat | Bleeding over 5 minutes, no eating for 24 h |
Nerve signs that need a same-day visit
Current travelling through the spinal cord and peripheral nerves can leave a cat with hind-limb weakness, a stiff gait, or a dropped jaw for 3 to 10 days; most of these deficits fade, but they need to be documented on day 1. Seizures within the first 24 hours are a different matter and mean hospitalization. A cat that cannot blink on one side, drools continuously, or holds its head tilted needs an exam the same day, because corneal exposure in a cat that cannot close the eye causes ulceration within 12 to 24 hours.
Household numbers that prevent the next bite
Most bites happen to cats under 2 years old, and most involve a cord under 60 cm off the floor. Cable covers of 2 to 3 mm wall thickness resist a determined kitten for minutes, not hours, so route cords behind furniture or inside conduit instead. Use a residual-current device rated to trip at 30 mA; it cuts power in 20 to 40 milliseconds, which is faster than a cat can be killed by 220 V. Tape down slack, keep charger ends unplugged when not in use, and give the cat a 30 cm length of thick rope or a wand toy as a substitute target. Bitter spray needs reapplying every 3 to 5 days and works on maybe half of cats.
Cost and follow-up
An exam, ECG, oxygen and one night in hospital is the low end; burns that need repair under anesthesia, plus repeat films, push the total higher depending on where you live. Budget for two rechecks, at 24 hours and at day 7 to 10, and ask for the ECG report in writing so the next vet can compare intervals. Soft food only for 5 to 7 days, no dry kibble that can crack the eschar, and wipe the chin with saline after eating rather than scrubbing.
Steps for the first hour
- Unplug the appliance or kill the breaker before touching the cat.
- No heartbeat: compressions at 100-120 per minute, 30 to 2, until you reach the clinic.
- Do not rinse the mouth with anything but saline; do not pry it open.
- Call ahead: electrical shock, voltage if known, unconscious or not.
- Count resting respiratory rate at 2, 6, 12 and 24 hours; above 40 means return.
A shocked cat often comes home with a catheter and a shaved leg; the first 72 hours follow the same rules as our catheter aftercare guide. Outdoor cats in the same household should get a full check, and the sequence in our tick removal guide covers the parts owners usually get wrong. For what an overnight stay and two rechecks actually add up to, see the cost estimator.
Frequently asked
Is a cat that bit a cord and seems fine still in danger?
Yes. Pulmonary edema and heart rhythm problems typically appear 6 to 24 hours after the shock, and the mouth burn looks smaller on day 1 than it will on day 5. Get an exam with an ECG and oxygen saturation the same day, count the resting respiratory rate at 2, 6, 12 and 24 hours, and return if it goes above 40.
Should I pull the cord out of my cat's mouth?
No. Pulling does not stop the current and puts your hand near a live conductor. Unplug the appliance at the wall or trip the breaker first, which takes 10 to 20 seconds, then touch the cat. If the cat is unconscious and has no heartbeat, start compressions at 100 to 120 per minute while someone calls the clinic.
How long does an electrical mouth burn take to heal?
Expect 3 to 4 weeks, with the worst point around day 7 to 10 when the eschar separates and the labial artery can bleed. The visible defect grows 2 to 5 mm wider than it looked at first. About 1 in 3 cats need a repair under anesthesia, and soft food for 5 to 7 days protects the healing edge.