Heat stroke kills dogs rapidly and is entirely preventable, with outdoor exercise and vehicle confinement being the most common causes that can be eliminated through owner education and behavior change.
Heat stroke is the archetype of a preventable welfare emergency - caused entirely by human decisions about vehicle confinement or exercise timing. A dog cannot understand why it is trapped in a hot car and dying, but experiences the full terror and physiological agony of hyperthermia. The welfare solution is simple: never leave dogs in parked vehicles, walk dogs in early morning or evening during heat, and recognize warning signs immediately. First aid cooling must begin immediately - every minute of critical hyperthermia causes irreversible organ damage.