Dog Heat Stroke First Aid
By Sarah Chen · Reviewed by Dr. James Carter, DVM · Last reviewed: May 15, 2026
Heat stroke kills dogs in under an hour. Here are the 6 steps that can save your dog's life.
Call your vet right now if your dog shows heat stroke signs
Collapse, vomiting, bloody stool, seizures, or a rectal temp above 106 degrees F all mean emergency vet, right now. Cool while someone drives.
If your dog shows signs of heat stroke, call your vet immediately. This page is informational, not veterinary advice. Always follow your vet's direct guidance.
Body Temp: What the Numbers Mean
A dog's rectal temp tells you how serious things are. Use a digital pet thermometer for the most accurate reading.
| Temp Range | Stage | What to Do |
|---|---|---|
| 101 to 102.5 degrees F | Normal | Healthy resting body temp for a dog. |
| 103 degrees F | Warm | Get your dog to shade and water. Watch closely. |
| 104 to 105 degrees F | Heat exhaustion | Start cooling. Call your vet now. |
| 106 to 108 degrees F | Heat stroke | Medical emergency. Cool and transport to the vet. |
| 109 degrees F or higher | Life threatening | Organs shut down. Drive to the ER vet right now. |
6 Step First Aid
- 1
Move to shade or AC
Get your dog out of the sun. A cool room with the AC on is best. Open shade is second best.
- 2
Cool water on paw pads and groin
Pour cool tap water on the paw pads, belly, groin, and armpits. Use a wet cloth on the chest. Do not use ice water. Ice water shrinks blood vessels and traps the heat inside.
- 3
Wet towels on chest, fan air across
Soak towels in cool water and lay them on the chest and back. Point a fan at your dog. Moving air pulls heat off the wet fur faster than wet fur alone.
- 4
Call your vet now
Call while you cool. Tell them you are on the way. Heat stroke causes organ damage within minutes, even after the dog seems better.
- 5
Check the temp every 5 minutes
Use a rectal pet thermometer if you have one. Stop cooling once the temp drops to 103 degrees F. Over-cooling can swing into hypothermia.
- 6
Transport in an AC car
Run the AC full blast. Keep the wet towels on. Even if your dog perks up, the vet still needs to check for kidney and brain damage.
When to Drive to the ER Vet
Some signs mean you skip the home cooling and drive. Call your vet from the car. Use these as your go-now signs:
- Rectal temp at or above 106 degrees F
- Collapse or trouble standing
- Vomiting or bloody diarrhea
- Seizures or muscle tremors
- Dark red, purple, or pale gums
- Confusion or glassy eyes
- Loss of consciousness
Even after your dog cools down and seems fine, the AKC and AVMA both recommend a vet check. Kidney damage and blood clotting problems can show up hours later.
Prevent Heat Stroke Before It Starts
The best treatment is prevention. Walk before 8 AM or after 7 PM in summer. Always have shade, water, and a cool surface. A cooling mat or cooling vest cuts heat stroke risk on hot days, especially for flat-faced breeds.
Sources
- American Kennel Club (AKC), Heat Stroke in Dogs.
- American Veterinary Medical Association (AVMA), Pet Safety in Hot Weather.
- American College of Veterinary Emergency and Critical Care (ACVECC), Heat Stroke Guidelines.
Questions
What is the difference between heat exhaustion and heat stroke in dogs?
Heat exhaustion starts at a rectal temp of 104 degrees F. Signs include heavy panting, drooling, and weakness. Heat stroke starts at 106 degrees F. Signs include collapse, vomiting, bloody diarrhea, and seizures. At 109 degrees F or higher, organs start to shut down. Both stages need a vet, but heat stroke is a life-threatening emergency.
Should I use ice water to cool a dog with heat stroke?
No. The American College of Veterinary Emergency and Critical Care (ACVECC) advises against ice water. Ice water makes blood vessels in the skin shrink, which traps heat in the body core. Use cool tap water, not cold or icy water. Pour it on the paw pads, groin, belly, and armpits where blood vessels run close to the skin.
How fast can a dog die from heat stroke?
A dog can die from heat stroke in under an hour at body temps above 109 degrees F. Brain, kidney, and liver damage starts within minutes. Even with treatment, the AVMA reports a death rate of around 50 percent for dogs with severe heat stroke. Fast first aid and a fast trip to the vet are what saves lives.
Do I still need to see the vet if my dog seems fine after cooling down?
Yes. Always. Heat stroke causes hidden internal damage, even when the dog looks recovered. Kidney failure, blood clotting problems, and brain swelling can show up hours later. The AKC and AVMA both recommend a vet check after any suspected heat stroke episode.
What is a normal body temperature for a dog?
101 to 102.5 degrees F is normal. 103 degrees F is warm and a warning sign. 104 degrees F or higher is heat exhaustion. 106 degrees F or higher is heat stroke. Use a digital rectal thermometer for the most accurate reading. Ear thermometers are not as reliable for dogs.
Which dogs are at highest risk of heat stroke?
Flat-faced (brachycephalic) breeds like Bulldogs, Pugs, French Bulldogs, and Boxers are at the highest risk. Their short snouts make panting less efficient. Other high-risk groups include senior dogs, puppies under 6 months, overweight dogs, and thick-coated breeds like Huskies and Malamutes. Dogs left in parked cars are at extreme risk even on mild days.
How long should I cool my dog before driving to the vet?
Start cooling for 2 to 5 minutes while someone calls the vet. Then transport. Do not delay the vet trip to keep cooling at home. Cool with wet towels in the car with the AC on full blast. The goal is to drop the temp to 103 degrees F by the time you arrive.
Can heat stroke happen indoors?
Yes. Dogs left in homes without AC during heat waves can develop heat stroke, especially flat-faced breeds. Sunrooms, garages, and small bathrooms get dangerously hot even on 80 degree days. Always provide AC, a fan, cool water, and a cooling mat during summer heat.
What signs mean it is time to call the emergency vet?
Collapse, vomiting, bloody stool, seizures, glassy eyes, dark red or purple gums, or rectal temp above 106 degrees F all mean ER vet, right now. Do not wait. Call ahead so the clinic can prep for IV fluids and oxygen.
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