Heavy panting, drooling, bright red gums, weakness, vomiting, diarrhea, collapse, or seizures. Body temp above 104°F (40°C) is dangerous; above 106°F (41°C) is life-threatening.
Out of the sun and heat right away. Never leave a pet in a parked car — even with windows cracked, temperatures reach fatal levels in minutes.
Pour cool (not ice cold) water over the body, especially belly, paws, ears, and armpits. Use a fan to speed evaporation. Ice cold water and ice constrict blood vessels and slow cooling.
If conscious and able to drink, allow small sips. Do not force water — it can be inhaled.
Heatstroke causes internal organ damage that may not show for hours. All cases need vet evaluation, ideally within 30 minutes.
Guidance only — in any emergency, call 911.