Heatstroke from being left in hot cars is a preventable cause of dog deaths that kills hundreds of dogs annually, with core body temperature rising to fatal levels within minutes.
Hot car death is one of the most preventable causes of dog mortality. Dogs left in parked cars on mild days die in distress as their core temperature exceeds 40°C and continues rising. The suffering involved — distress, panting failure, convulsions, and death — is severe and entirely avoidable. Prevention requires a single, simple rule: never leave a dog unattended in a parked car. If you see a dog in a hot car showing signs of distress, in many jurisdictions you have both legal and moral justification for breaking a window to render assistance.