Dogs left in parked vehicles face rapid and potentially fatal heat stress. Understanding the physiology and prevention of heat stroke is critical for all dog owners.
Heat stroke in dogs is both a major welfare emergency and a largely preventable cause of death and suffering. Dogs die in hot vehicles because they cannot escape and cannot effectively thermoregulate in enclosed heat. The suffering of heat stroke — distress, seizures, organ failure — is severe. Prevention is straightforward: never leave dogs in vehicles in warm weather, even briefly, even with windows cracked. Heat stroke survivors often experience permanent organ damage, meaning the welfare impact extends beyond the acute event.