Why dogs overheat faster than we do
Dogs cool themselves primarily by panting and through small sweat glands in their paw pads. On a humid day, panting becomes far less efficient — moisture from their breath cannot evaporate quickly enough. Flat-faced breeds (pugs, bulldogs, boxers), senior dogs, puppies, and dogs with thick double coats are at the highest risk.
A dog's normal body temperature is 101–102.5°F (38.3–39.2°C). Heatstroke begins at 104°F (40°C) and becomes life-threatening above 106°F (41.1°C). Organs start failing within minutes at those temperatures.
Early warning signs
Heavy, frantic panting
Faster and deeper than normal — often with a wide tongue hanging low.
Thick, sticky drool
Saliva becomes ropey instead of watery as dehydration sets in.
Bright red gums
Healthy gums are bubblegum pink. Red, dry, or pale gums are a red flag.
Wobbly, disoriented
Stumbling, glazed eyes, or collapsing means you are already in an emergency.
First 5 minutes: what to do
- Move your dog into shade or air conditioning immediately.
- Wet their body with cool (not ice-cold) water — focus on belly, paws, and armpits.
- Place a fan in front of them if available; evaporation does the cooling.
- Offer small sips of water — never force-drink an overheated dog.
- Call your emergency vet en route. Heatstroke always warrants a vet visit even if they recover.
Prevention: simple summer habits
- Walk before 8am or after 7pm during heatwaves — pavement above 125°F burns paws.
- Press the back of your hand to the sidewalk for 7 seconds. If it is too hot for you, it is too hot for them.
- Never leave a dog in a parked car, even with windows cracked — interiors hit 120°F in 20 minutes.
- Carry a collapsible water bowl and offer water every 15 minutes on hot walks.
- Use cooling mats and elevated beds at home so air can circulate underneath.