Managing and preventing heat stroke in cats — a rapidly fatal condition without immediate intervention.
Heat stroke in cats causes catastrophic, rapidly progressive welfare impairment. Cats are efficient at conserving heat but less effective at dissipating it compared to dogs — they pant less effectively and rely more on behavioural thermoregulation. When caught in hot environments without escape, their temperature rises rapidly. Internal temperatures above 41°C cause protein denaturation, cellular death, coagulation abnormalities, and multi-organ failure.
The welfare of established heat stroke is extreme. Severely affected cats are obtunded or comatose, may be seizing, and show signs of cardiovascular compromise. Brain damage from prolonged hyperthermia may be irreversible. Even cats that survive heat stroke may suffer lasting organ damage — particularly renal failure — that impairs long-term welfare.
Prevention is straightforward and essential. Cats should never be confined in hot environments without adequate ventilation and shade. Cars in summer sunshine reach lethal temperatures within minutes — cats should never be transported and left unattended in vehicles. Monitoring vulnerable cats (elderly, obese, long-haired, or those with pre-existing conditions) during hot weather prevents heat-related emergencies.