Heat Stroke in Dogs: Signs, Emergency Cooling & What to Do
If you're searching for signs of heat stroke in dogs because your dog is panting hard, weak, stumbling, vomiting, acting confused or simply doesn't look right after being in the heat, don't spend twenty minutes reading first.
Move your dog into air conditioning or shade, begin safe cooling with cool or tepid water and airflow, and contact your veterinarian or emergency hospital immediately.
Dogs can go from uncomfortable to dangerously overheated faster than many pet parents realize — especially when heat and humidity are working together.
And here along the Carolina coast, humidity is a huge part of that conversation. A walk that doesn't feel outrageous to you can be much harder on your dog, particularly if your dog is older, overweight, short-nosed, out of condition or living with heart or respiratory problems.
I don't believe every dog needs to "push through" a walk because it's normally walk time.
Sometimes the smartest thing you can do is listen when your dog tells you he's had enough.
Signs of Heat Stroke in Dogs
One of the most common questions dog parents ask is:
"How do I know if my dog is overheating?"
You don't have to wait for collapse before taking heat stress seriously.
Early Signs Your Dog May Be Overheating
- Heavy or excessive panting
- Difficulty settling even after activity stops
- Excessive drooling or thick, ropey saliva
- Seeking shade, cool floors or water
- Slowing down
- Refusing to continue a walk
- Restlessness
- Very red gums or tongue
- Rapid breathing
Don't dismiss these signs simply because your dog is still standing or willing to follow you.
The best time to respond is before the dog progresses into a crisis.
Emergency Signs of Heat Stroke
- Weakness or extreme lethargy
- Stumbling or poor coordination
- Confusion or disorientation
- Vomiting
- Diarrhea, sometimes with blood
- Pale, gray, very dark red or otherwise abnormal-looking gums
- Rapid or irregular heartbeat
- Collapse
- Seizures
- Loss of consciousness
If your dog's breathing, movement, awareness or behavior is making you think, "Something isn't right," get the dog out of the heat. I'd much rather see you respond early than spend ten more minutes trying to convince yourself you're overreacting.
What to Do If Your Dog Is Overheating
If your dog is showing signs of heat stroke, start cooling while you contact your veterinarian or emergency hospital and prepare to go in.
Cooling is first aid. It does not replace veterinary care.
How to Cool an Overheated Dog Safely
- Move your dog out of the heat immediately.
- Get into air conditioning or deep shade.
- Wet the body with cool or tepid water.
- Focus on the neck, chest, belly and other large body areas.
- Use a fan or air conditioning to move air across the wet coat.
- Offer small amounts of cool water if your dog is alert and swallowing normally.
- If you can safely take a rectal temperature, monitor it while cooling.
- Stop active cooling when the temperature reaches approximately 103°F.
- Continue to the veterinarian even if your dog seems much better.
- Do not use an ice bath.
- Do not pack the dog in ice or ice packs.
- Do not use extremely cold water.
- Do not wrap the dog in wet towels and leave them wrapped.
- Do not force water into a weak, confused, vomiting or semi-conscious dog.
- Do not continue aggressive cooling once the temperature is around 103°F.
- Do not assume the danger is over simply because the panting improves.
Why Does My Dog Still Need a Vet After Cooling Down?
This is where heat stroke can fool people.
You can get the body temperature down.
The panting may settle.
Your dog may stand up, drink and look considerably better.
That does not tell us what has happened internally.
Severe hyperthermia can affect multiple systems in the body, including the kidneys, liver, gastrointestinal tract, brain and normal blood-clotting mechanisms.
Some complications may not be immediately visible.
That's why suspected heat stroke deserves veterinary evaluation even when your dog appears to recover after cooling.
Can Heat Stroke Cause Problems Days Later?
Yes.
This is particularly important because your Search history may look like:
"My dog had heat stroke two days ago and now isn't eating."
"My dog seemed fine after overheating but is lethargic today."
"Can heat stroke affect a dog days later?"
The answer is that secondary complications can develop after the obvious overheating episode has passed.
Depending on the severity of the heat injury, problems can involve the:
- Kidneys
- Liver
- Gastrointestinal tract
- Brain and nervous system
- Blood-clotting system
Over the hours and days following significant heat stroke, watch for:
- Ongoing or returning lethargy
- Weakness
- Poor appetite or refusal to eat
- Vomiting
- Diarrhea
- Blood in the stool
- Unusual bruising or bleeding
- Changes in thirst
- Changes in urination
- Stumbling or weakness
- Confusion or other neurologic changes
- A dog who simply seems to be getting worse instead of better
Don't assume a new symptom is unrelated simply because the dog's temperature came down earlier.
What Temperature Is Heat Stroke in a Dog?
A normal dog's temperature is generally around 100°F to 102.5°F.
A temperature above the normal range is hyperthermia, and heat stroke commonly involves body temperatures above approximately 104°F.
But I don't want dog parents waiting for a magic number before taking action.
The thermometer is one piece of information. Your dog's condition is another.
A dog who is weak, confused, vomiting, collapsing or neurologically abnormal after heat exposure needs emergency attention whether or not you managed to get an exact temperature.
Which Dogs Are Most at Risk for Heat Stroke?
Any dog can overheat, but some deserve considerably more caution.
- Senior dogs
- Puppies and young dogs
- Brachycephalic dogs such as Bulldogs, French Bulldogs, Pugs and other short-nosed breeds
- Overweight dogs
- Dogs with heart disease
- Dogs with respiratory or airway disease
- Dogs with kidney disease or other chronic illness
- Dogs who have previously suffered heat stroke
- Dogs exercising hard in warm or humid weather
Short-nosed dogs deserve special attention because their anatomy can make efficient panting and heat dissipation more difficult.
How Hot Is Too Hot to Walk a Dog?
I don't love giving dog parents one universal outdoor temperature and pretending every dog becomes unsafe at exactly that number.
That's not how dogs work.
An 80-degree morning with low humidity is not the same as 80 degrees with oppressive coastal humidity.
A fit two-year-old dog is not the same as a 13-year-old dog with heart or respiratory issues.
Shade, direct sun, airflow, humidity, surface temperature, fitness, breed, age and health all change the equation.
Once temperatures climb into the 80s — particularly with high humidity — I become much more conservative about strenuous outdoor exercise.
And if your dog is telling you he's done by slowing down, seeking shade, refusing to continue or panting unusually hard, the walk is over.
Hot Pavement and Sand Matter Too
The temperature on your weather app tells you the temperature of the air.
It does not tell you how hot asphalt, concrete, sand or another sun-exposed surface has become.
A dog walking close to the ground is dealing with heat from above and radiant heat from below.
At the beach, hot sand can become uncomfortable or damaging to paws long before the family is ready to pack up for the day.
So when you're deciding whether to walk, don't evaluate only the air temperature.
Humidity Matters More Than Many Dog Parents Realize
Dogs rely heavily on panting to release excess body heat.
Evaporation becomes less efficient when the air is already loaded with moisture.
That's why a humid Carolina afternoon may be much harder on a dog than the temperature alone suggests.
Here in North Myrtle Beach, Myrtle Beach, Brunswick County and the surrounding coastal areas, I don't use the temperature number by itself to decide whether a dog should be exercising outside.
Can Dogs Get Heat Stroke at the Beach?
Absolutely.
Vacationing families understandably want their dogs included in beach days.
But a beach outing may combine:
- Direct sun
- High humidity
- Hot sand
- Reflection from sand and water
- Excitement
- Running and swimming
- Limited shade
- Salt-water ingestion
Dogs may also keep playing well past the point when they should have stopped because they're excited and stimulated by everything happening around them.
A beach vacation is not the time to test how much heat your dog can tolerate.
Early-morning outings, evening walks, short play periods, shade, frequent breaks and access to fresh water may be much better choices than spending the entire afternoon on the sand.
If your dog is swallowing ocean water while playing, also read My Dog Drank Ocean Water: Salt Water Poisoning in Dogs.
How to Prevent Heat Stroke in Dogs
Most heat-stroke prevention isn't complicated.
It just requires making the decision before your dog is already in trouble.
- Schedule walks and strenuous activity during cooler parts of the day.
- Shorten walks when heat or humidity rises.
- Bring fresh water on walks, hikes, beach outings and road trips.
- Provide shade and frequent rest periods.
- Keep senior, overweight and short-nosed dogs inside during the worst heat.
- Never leave a dog unattended in a parked vehicle.
- Pay attention when your individual dog starts slowing down.
- Keep a digital rectal thermometer in your canine first-aid supplies.
- Save your regular veterinarian and nearest emergency hospital in your phone before you need them.
Dogs in Cars and RVs: Don't Trust the Weather Outside
The temperature inside an enclosed vehicle can become dangerous quickly.
A cracked window isn't a cooling system.
If you travel with dogs in an RV, camper or vehicle and there are times when they may be inside without you, I like having an independent temperature-monitoring system rather than simply trusting that the air conditioning will always behave itself.
I use and recommend systems such as the Waggle Pet Temperature Monitor, which can alert your phone when temperatures move outside the range you've set.
No meal, shopping trip or quick errand is worth gambling with heat stroke.
Heat Stroke in Dogs: Questions Pet Parents Ask
How do I know if my dog is overheating or just panting?
Look at the whole dog rather than panting alone. Panting that is much harder than expected, excessive or thick drool, weakness, slowing down, unusual gum color, restlessness, stumbling, vomiting, confusion or refusing to continue an activity are more concerning than ordinary panting after mild exercise. If your dog's breathing or behavior looks abnormal for that dog, move somewhere cool and reassess immediately.
Should I use ice water for a dog with heat stroke?
No. Current veterinary guidance recommends cool or tepid water rather than ice baths, ice packs or extremely cold water. Wet the body and use airflow from a fan or air conditioning to help release heat.
Should I put wet towels over an overheated dog?
I would not wrap an overheated dog in wet towels. As the towels warm against the body, they can interfere with evaporation and trap heat. Wet the dog directly with cool or tepid water and keep air moving across the wet coat instead.
Can I give my overheated dog water?
If your dog is alert, responsive and swallowing normally, offer small amounts of cool water. Do not force water into the mouth of a dog who is vomiting, collapsing, confused, extremely weak or unable to swallow normally.
What temperature should I stop cooling my dog?
If you are safely monitoring rectal temperature, active cooling is generally stopped at approximately 103°F. The dog's temperature may continue falling after active cooling stops, so continuing aggressive cooling can result in hypothermia.
Can a dog recover from heat stroke at home?
A dog may appear much better after cooling, but suspected heat stroke still warrants veterinary evaluation. Internal complications involving organs, the gastrointestinal system, brain or normal blood clotting may not be immediately visible.
Can a dog have problems days after heat stroke?
Yes. Secondary complications can develop after the initial overheating episode, including problems involving the kidneys, liver, gastrointestinal tract, nervous system and blood clotting. If your dog becomes lethargic, weak, stops eating, vomits, develops diarrhea or bleeding, changes drinking or urination, or simply seems abnormal over the hours or days following heat stroke, contact your veterinarian.
Why is my dog lethargic the day after heat stroke?
Continued lethargy after significant heat stroke should not automatically be dismissed as simple exhaustion. Heat injury can affect multiple organ systems, and delayed complications are possible. Contact your veterinarian, particularly if lethargy is accompanied by poor appetite, vomiting, diarrhea, weakness, abnormal urination or behavior changes.
How long does it take a dog to recover from heat stroke?
There is no single recovery timeline. It depends on how high the body temperature became, how long the dog was overheated, how quickly cooling and veterinary treatment began, the dog's health before the episode and whether organ damage occurred. Severe cases may require hospitalization and continued monitoring.
Can a dog get heat stroke without being left in a hot car?
Absolutely. Dogs can develop heat stroke during walks, running, hiking, beach outings, yard time, training, play or prolonged time outdoors in hot and humid conditions. Cars are one major risk, but they are certainly not the only one.
Are senior dogs more likely to overheat?
Yes. Senior dogs can be more vulnerable to heat, particularly when aging is accompanied by heart disease, respiratory disease, reduced conditioning, obesity, kidney disease or other chronic health changes. I become considerably more conservative with strenuous outdoor activity as dogs age.
Is 80 degrees too hot to walk my dog?
There isn't one temperature that is safe or unsafe for every dog. Around 80°F and above, particularly with high humidity or direct sun, I become increasingly cautious. Breed, age, weight, health, conditioning, surface temperature, shade and humidity all change the risk. Your individual dog's response should always be part of the decision.
Can humidity cause a dog to overheat even when it isn't extremely hot?
Yes. Dogs rely heavily on evaporation through panting to release heat. High humidity makes evaporation less efficient, so humid conditions can increase heat-stress risk even when the air temperature does not look extreme.
Can dogs get heat stroke while swimming?
Yes. Swimming does not make a dog immune to heat stress. Dogs may continue running, retrieving and swimming for long periods because they're excited, and humid weather or strenuous exercise can still create significant heat load. Swimming dogs may also swallow large amounts of fresh or salt water, which creates additional concerns.
I'd Rather You Head Inside Too Early
Heat stroke isn't one of those situations where I want to see whether the dog can tough it out.
If your dog says he's done, he's done.
Skip the rest of the walk.
Cut the beach outing short.
Go back into the air conditioning.
Bring the water.
Change the schedule.
And if your dog is showing weakness, confusion, vomiting, abnormal gum color, collapse, seizures or other signs of significant heat stress, treat it as the emergency it is.
I'd much rather have a dog mom tell me she reacted a little too early than tell me she waited because she wasn't sure it was serious enough.
This article is educational and is not a substitute for veterinary diagnosis or emergency treatment. If you suspect heat stroke, contact your veterinarian or emergency hospital immediately while beginning safe cooling measures.
Graphic Credit: Unchained Greensboro