Heatstroke in Dogs: Signs & Emergency Care

Heatstroke is one of the most preventable causes of death in dogs. Yet every summer, thousands of dogs die from being left in hot cars or over-exercised in the heat. Knowing the signs and acting fast can save a life.

Why Dogs Are Vulnerable

Dogs don't sweat like humans. They cool themselves primarily through panting and a small amount through their paw pads. Brachycephalic breeds (Bulldogs, Pugs, Boxers) are at extreme risk because their shortened airways make panting inefficient. Older dogs, overweight dogs, and dogs with heart or respiratory conditions are also at higher risk.

How Fast It Happens

On a 78°F (25°C) day, the temperature inside a parked car reaches 100°F (38°C) in 10 minutes and 120°F (49°C) in 30 minutes. Cracking the windows does almost nothing. A dog's internal temperature can reach fatal levels within 15 minutes.

Warning Signs

Early signs: Excessive panting, drooling, red gums, rapid heart rate, disorientation.

Advanced signs (organ damage is occurring): Vomiting, diarrhea (may be bloody), collapse, seizures, dark red or purple gums, unconsciousness.

A dog's normal temperature is 100-102.5°F (37.8-39.2°C). Heatstroke occurs above 105°F (40.6°C). Above 107°F (41.7°C), organ damage begins within minutes.

What to Do Immediately

Do NOT give ice water or ice — this constricts blood vessels and actually traps heat. Cool the dog GRADUALLY. Move to shade or air conditioning. Pour cool (not cold) water over the body, focusing on the neck, armpits, and groin. Place cool, wet towels on these areas — replace every few minutes as they warm up. Offer small amounts of cool water if the dog can drink. Use a fan to increase evaporative cooling. Transport to the nearest veterinary emergency hospital immediately.

At the Vet

IV fluids to cool the body from the inside, oxygen therapy, blood work to assess organ damage (kidneys, liver, coagulation), medications to control seizures or protect the GI tract, and ICU monitoring for 24-72 hours.

Prevention

Never leave your dog in a parked car. Not even for "just a minute." Not even with the windows cracked. Not even on a cloudy day. Walk dogs early morning or late evening during hot weather. Check pavement temperature — if you can't hold your hand on it for 5 seconds, it's too hot for paw pads. Always carry water. Provide shade and ventilation at all times.

Heatstroke is 100% preventable. Don't let it happen to your dog.