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Heatstroke is a term commonly used for hyperthermia or elevated body temperature. Generally speaking, if a pet’s body temperature exceeds 103°F (39.4°C), it is considered abnormal or hyperthermic. Body temperatures above 106°F (41°F) without previous signs of illness are most commonly associated with exposure to excessive external or environmental heat. The critical temperature where multiple organ failure and impending death occurs is 109°F (42.7°C).