![]() The thermoregulatory center goes on to activate panting to maximize evaporation and support cooling. Heat is produced by the dog’s normal metabolism and activity, which in turn activates the thermoregulatory center in the hypothalamus. In order to maintain normal cellular and bodily function, a body will activate the respiratory system, induce heat shock proteins and the acute phase response, and increase cardiac output in response to heat stress. Heat stroke is a relatively common condition in dogs therefore, it is important for veterinarians to understand the pathophysiology, diagnosis, treatment, prevention, and prognosis. Working dogs can develop hyperthermia in as little as 30 minutes unless adequate shade, water, and rest is available. Death can occur in an hour, especially in animals that are predisposed. It has been shown that temperatures inside a closed car exposed to sun may exceed 120 ˚F in less than 20 minutes when the outside temperature is only 75 ˚F. Heat stroke can occur rapidly, especially in situations where there is little ventilation or in environments that have high ambient temperatures and humidity. ![]() ![]() ![]() Heat stroke, or hyperthermia, is defined as a severe elevation in body temperature from 104.9 to 109.4 ˚F and is considered the most serious of the heat-induced illnesses.
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