Heatstroke

Heatstroke is one of the fastest-moving emergencies a cat owner can face, and because cats are so good at masking discomfort it is frequently recognised only once the cat is already in serious trouble. A cat's normal body temperature sits around 38.5°C (101.5°F). Once the core climbs past roughly 40°C (104°F) the body's cooling mechanisms are overwhelmed, and above about 41°C (106°F) proteins and organs begin to sustain direct heat damage.

Unlike dogs, cats rarely pant, so panting or open-mouthed breathing in a cat is a red flag that it is already struggling to cope. Other early signs include restlessness, seeking out cool tiles or sinks, excessive grooming to spread cooling saliva, and warm ears. As heatstroke progresses the gums turn bright red — and later a dangerous grey or blue — the cat drools, becomes wobbly and disoriented, may vomit or have diarrhoea, and can ultimately collapse, seizure or fall unconscious.

The damage does not stop when the cat is cooled down. Severe heatstroke can set off a cascade over the following hours and days: acute kidney injury, swelling of the brain, breakdown of the gut lining, and a life-threatening clotting disorder called disseminated intravascular coagulation (DIC). This is exactly why every heatstroke case, even an apparently mild one, needs veterinary assessment and often a day or two of monitoring.

First aid buys time but is not a substitute for the vet. Move the cat somewhere cool, wet its coat and paw pads with cool tap water, direct a fan over it, and offer small amounts of cool water if it can drink. Crucially, never plunge a cat into ice water or pack it in ice: this constricts the surface blood vessels, traps heat in the core, and can tip an already stressed cat into shock. Cool steadily, stop active cooling once the cat is comfortable, and let the veterinary team take over. With prompt, measured treatment many cats recover fully — but prevention, by never allowing a cat to become trapped in the heat in the first place, is always the real cure.