Dog heatstroke is a medical emergency. If your dog is panting heavily after heat exposure or exercise and becomes weak, confused, unsteady, sick, or unable to continue normally, move them out of the heat and begin active cooling immediately while arranging veterinary care. Do not wait for collapse or for a thermometer reading before taking the situation seriously.
What to Do Right Now
- Stop exercise and get your dog somewhere cool. Move into shade, air conditioning, or another well-ventilated cooler area.
- Start active cooling. Apply cool running water over the trunk behind the neck, focusing especially on thinner-haired areas such as the underside of the abdomen. For thick-coated dogs, make sure the water reaches the skin rather than only wetting the outer coat. Keep water away from the face and airway.
- Add airflow. Use a fan, breeze, or air conditioning while the coat is wet to help remove heat.
- Contact a veterinarian or emergency hospital as cooling begins. After the initial cooling period, transport your dog for veterinary assessment. Use an air-conditioned vehicle if possible.
If your dog is fully alert and swallowing normally, you can offer access to small amounts of water. Do not force water into the mouth of a weak, confused, vomiting, collapsing, or unconscious dog.
The 2026 RECOVER veterinary first-aid guidelines emphasize beginning active cooling before simply loading an overheated dog into a vehicle. The goal is to reduce the amount of time the body remains dangerously hot while still getting the dog to professional care promptly.
Early Signs of Heatstroke in Dogs
Heat-related illness can begin before a dog collapses. Recognizing the earlier signs matters because overheating may continue to worsen even after exercise stops.
Warning signs can include:
- Constant or unusually heavy panting
- Suddenly slowing down, lying down, or refusing to continue walking or playing
- Restlessness or urgently seeking shade or water
- Heavy drooling or excessive salivation
- Red-looking gums or tongue
- Vomiting or diarrhea
- Weakness or unusual fatigue
As heat-related illness becomes more severe, a dog may develop stumbling, disorientation, abnormal or noisy breathing, collapse, seizures, or reduced responsiveness. Vomiting or diarrhea may also become severe or contain blood.
You do not need every sign on this list before acting. A dog that has been exercising or exposed to heat and suddenly cannot continue normally deserves immediate cooling and veterinary advice.
How to Cool a Dog Safely Before Transport
The 2026 RECOVER First Aid Guidelines for Dogs and Cats recommend moving an animal with suspected heatstroke into a cool environment and beginning active cooling before transport when it is safe to do so.
Use Cool Running Water on the Trunk
Run cool water over your dog's body behind the neck, especially over the abdomen and other areas where the hair coat is thinner. For thick-coated dogs, soak through to the skin.
Running or repeatedly refreshed water is preferred to wetting the coat once and leaving warmed water sitting against the body.
Keep running water away from the face and mouth to reduce the risk of water entering the airway.
Use Air Movement at the Same Time
A fan, air conditioning, or natural airflow can help evaporation remove additional heat once the coat is wet.
If possible, cool the vehicle before transport and keep the air conditioning running on the way to the veterinary hospital.
If You Have a Rectal Thermometer
If you already know how to take your dog's rectal temperature safely, RECOVER suggests stopping active cooling when the temperature reaches about 103.5–104°F (39.7–40°C). Stop the running water, dry the dog, and proceed immediately to veterinary care.
Do not wrestle with a frightened, collapsing, or distressed dog simply to obtain a temperature. A thermometer can guide cooling, but measuring one should never delay first aid or put you at risk of being bitten.
Important upper-airway exception: If your dog has loud, harsh, snoring-like or high-pitched breathing from the upper airway—called stertor or stridor—tell the emergency clinic immediately. RECOVER suggests continuing active cooling until panting clearly improves or the rectal temperature reaches 101.5°F (38.6°C), whichever happens first. Do not intentionally cool below that point.
If you cannot safely measure a rectal temperature, RECOVER suggests about 15 minutes of active cooling before transport when that is feasible and safe. Call the veterinary clinic as cooling begins so the team can advise you based on your dog's breathing, condition, and travel time.
What Not to Do for Dog Heatstroke
- Do not wait for collapse. Heat-related illness can progress quickly.
- Do not wrap the dog in wet towels. A wet covering can reduce evaporation and become an insulating layer as it warms.
- Do not pack the dog in ice or place ice directly against the skin. Current first-aid guidance favors cool running water over improvised extreme cooling.
- Do not use rubbing alcohol on the paws or skin.
- Do not force drinking. Only offer water if the dog is fully alert and able to swallow normally.
- Do not give human fever medication. Heatstroke is not an ordinary fever, and common human medications can be dangerous to dogs.
- Do not assume the emergency is over because panting improves. Internal complications can develop even after the dog appears cooler.
When Should a Dog With Heatstroke Go to the ER?
If you genuinely suspect heatstroke, your dog should be evaluated by a veterinarian after initial cooling. You do not need to wait for a particular thermometer reading or dramatic collapse before calling.
After initial cooling, do not delay emergency transport if your dog has:
- Difficulty breathing or loud, abnormal breathing
- Weakness, wobbling, or inability to stand normally
- Confusion or unusual mental behavior
- Repeated vomiting or diarrhea
- Blood in vomit or diarrhea
- Pale, bluish, or markedly abnormal-looking gums
- Collapse
- Tremors or seizures
- Reduced responsiveness or unconsciousness
All dogs can develop heat-related illness, but some deserve an especially low threshold for emergency evaluation. Short-muzzled breeds such as Bulldogs, Pugs, and Boston Terriers can have more difficulty losing heat through panting. Older dogs, overweight dogs, thick-coated dogs, and dogs with heart, lung, or upper-airway disease may also be more vulnerable.
Why Your Dog Still Needs a Vet After Cooling Down
A dog may look noticeably better once their temperature begins to fall, but that does not necessarily mean the emergency is over.
According to the Cornell University College of Veterinary Medicine, severe heatstroke can affect multiple organs and contribute to acute kidney injury, abnormal blood clotting, shock, and neurologic complications.
Those problems are not always visible immediately. A dog that stands up, pants less, or seems more alert after cooling may still need blood tests, monitoring, fluids, oxygen, or other treatment.
What to Tell the Emergency Vet
A short timeline can help the veterinary team understand how much heat exposure may have occurred and what first aid has already been given.
Be ready to tell them:
- What your dog was doing before the episode
- Whether the exposure involved exercise, hot weather, a vehicle, or another enclosed space
- Approximately when the first abnormal signs appeared
- Whether your dog vomited, had diarrhea, stumbled, collapsed, or had a seizure
- Any temperature readings you obtained and when you obtained them
- How you cooled your dog and for approximately how long
- Any existing heart, breathing, neurologic, or other medical conditions
- Current medications
If someone else is with you, having that person call ahead while you begin cooling can save time and allow the hospital to prepare for your arrival.
What May Happen at the Veterinary Hospital
Treatment depends on how severely your dog has been affected. The veterinary team may continue controlled cooling if needed, evaluate breathing and circulation, provide intravenous fluids or oxygen when indicated, and monitor body temperature closely.
Blood and urine testing may be used to look for dehydration, electrolyte or glucose abnormalities, kidney or liver injury, and clotting problems. Dogs with significant heatstroke may need hospitalization because complications can continue to evolve after the initial overheating episode.
VCA Animal Hospitals likewise describes hyperthermia as an immediate medical emergency and notes that outcome depends partly on how high the body temperature became and how long the overheating lasted.
The Bottom Line
If your dog develops signs of heat-related illness, stop the activity, get them out of the heat, begin active cooling with cool running water, add airflow, and contact a veterinarian immediately.
If you can safely measure temperature, stop routine active cooling around 103.5–104°F (39.7–40°C) unless your veterinary team advises otherwise because of significant upper-airway noise. If you cannot measure temperature, current RECOVER guidance suggests about 15 minutes of active cooling before transport when feasible and safe.
Do not wait for collapse, and do not assume the danger has passed simply because your dog looks better after cooling.
Once your dog has been professionally assessed and the emergency is over, you can also review our pet first-aid kit checklist to prepare useful supplies for future emergencies.
This article provides general emergency first-aid information and cannot diagnose an individual dog or replace veterinary care.
Sources & Editorial Standards
Emergency recommendations in this guide were checked against current veterinary references, including the 2026 RECOVER First Aid Guidelines for Dogs and Cats, the Cornell University College of Veterinary Medicine heatstroke guidance, and VCA Animal Hospitals guidance on heatstroke in dogs. Recommendations are educational and should not delay professional veterinary care.
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