Take the dog immediately to a shaded, well-ventilated area away from heat.
Loosen the collar or harness to make breathing easier.
Use cool (room-temperature) water, not ice water, to lower the dog’s body temperature.
Focus on these areas:
Neck
Abdomen
Armpits
Paw pads
You can also use a fan or air conditioning to speed up cooling.
Do not immerse the dog in ice-cold water, as it may cause blood vessel constriction and organ damage.
Offer small amounts of cool water for the dog to drink.
Avoid forcing large amounts of water at once to prevent choking or stomach upset.
A dog’s normal body temperature is about 38℃–39℃ (100.4°F–102.2°F).
Heatstroke may push it over 40℃ (104°F).
Cool the dog gradually until the temperature drops to around 39.5℃ (103°F), but avoid overcooling.
Even if the dog seems to recover, take it to a veterinarian right away.
Heatstroke can cause neurological damage and organ failure, requiring professional treatment.