
Most dog owners picture heat stroke happening one way: a dog left in a hot car. But that's not actually where most cases come from. A large-scale UK veterinary study tracking over 900,000 dogs found that exercise, regular walks, hikes, fetch in the yard, caused 74% of heat stroke cases. Hot weather alone accounted for 13%. Cars made up just 5%.
In other words, the dog most at risk of heat stroke isn't the one left behind. It's the one out enjoying the day with you.
That's not meant to scare you off summer walks. It's meant to help you actually protect your dog, because the real risk looks different than most of us assume. Dogs can't cool themselves the way we do. They have very limited sweat glands (just in their paw pads) and rely almost entirely on panting to bring their body temperature down. Panting works a lot less well once humidity climbs, and it barely works at all for flat-faced breeds.
⚠️ IMPORTANT: If you suspect your dog is suffering from heat stroke, start cooling them down and contact a vet immediately.
Here's everything you need to know about heat stroke in dogs: what it actually is, the early signs to watch for, who's most at risk, and exactly what to do if it happens.
Jump Ahead: How to Prevent and Treat Heat Stroke in Your Dog
Heat-related illness in dogs sits on a spectrum, and it helps to know where your dog is on it so you can respond appropriately.

In this chart, see how temperature's relate to risk level with your dog, as well as what to do when temperatures reach these levels. This range is from below 70 degrees, which is considered safe for dogs, to 95+ degrees, which is very dangerous.
At this stage, your dog is just starting to overheat. You'll usually see increased thirst, panting, and a dog who starts hunting for shade on their own. If you take a break and let them cool down, they typically bounce back fast with no medical care needed.
This is the stage between "starting to overheat" and a true medical emergency. Your dog's body is struggling to keep up, even though they haven't crossed into heat stroke territory yet. This is your cue to stop the activity and start cooling them down immediately.
Heat stroke means your dog's core body temperature has climbed above 104°F, and their body can no longer bring it back down on its own. At this point, the heat can damage vital organs if your dog doesn't cool down fast. This is always a "call the vet now" situation, not a "wait and see."
Heat stroke can start subtle and escalate fast, which is exactly why it catches so many owners off guard. Since your dog can't tell you they're overheating, it's on you to read their body language and catch it early.
Early signs to watch for:
Signs of a medical emergency, get to a vet immediately:
If your dog hits any of the emergency-level signs, don't wait to see if they improve on their own. Start cooling them down and get to a vet right away.
Here's the breakdown from that same VetCompass study of UK veterinary records:
The rest comes down to a mix of individual factors, which we'll get into next.
A few things make this worse. Humidity is a big one. Dogs cool down almost entirely through panting, and panting works by evaporating moisture off their tongue and airway. When the air is already saturated with moisture, that evaporation slows way down, so a humid 80°F day can be more dangerous than a dry 90°F one.
Your dog's acclimation matters too. A dog who's spent the winter mostly indoors and suddenly gets a long hike on the season's first hot weekend is at higher risk than a dog who's had weeks to adjust gradually.
Every dog can get heat stroke. But research consistently shows some dogs are carrying a much heavier risk than others, and knowing where your dog falls matters for how careful you need to be.
Compared to Labrador Retrievers (used as the baseline in the VetCompass breed study), these breeds showed a significantly higher risk of heat stroke:
A few patterns explain most of that risk:
Brachycephalic (flat-faced) breeds struggle to pant efficiently because of their airway structure. That includes Bulldogs, French Bulldogs, Pugs, and Boston Terriers. Research shows flat-faced dogs are about twice as likely to develop heat stroke as dogs with an average muzzle length.
Thick, double-coated breeds like Chow Chows and Golden Retrievers trap heat close to the body, working against them the same way a winter coat would on a hot day.
Bigger, heavier dogs run higher risk too. Giant breeds over 110 lbs were three times more likely to develop heat stroke, and this applies to both large-breed dogs and dogs carrying extra weight for their frame.
Age matters. Dogs over two are already at increased risk, and senior dogs (12+) face the highest risk of any age group, largely because older dogs have reduced cardiovascular and respiratory function and can't dissipate heat as efficiently.
None of this means other breeds are in the clear. It means these dogs need extra caution, and their owners should treat "it's a warm day" as a real planning factor, not background noise.
Now that you understand what heat stroke is and how it affects all dogs, let's talk about how to prevent it in your own pet.
Before anything else, get honest about where your dog lands. Are they brachycephalic? Getting up there in age? Carrying extra weight? A dog who checks multiple boxes needs a more conservative approach than a young, lean, average-muzzled dog.
Early morning and evening are almost always cooler than midday, even on days that don't feel that hot yet. If you're in the middle of a heat wave with no cool window at all, swap outdoor time for indoor enrichment or mental exercise instead. Your dog's brain gets tired too, and it doesn't come with a heat stroke risk.
Not sure what temperature is actually too much for your dog? We've got a full breakdown of how hot is too hot to walk a dog that accounts for humidity, pavement temp, and your dog's individual risk factors.
Fresh water should be available at all times, and that includes days that feel mild to you. Heat stroke doesn't require a heat wave. A humid 75°F afternoon can be enough to catch an unacclimated or at-risk dog off guard.
Asphalt holds heat well above the air temperature. Press the back of your hand to the pavement for ten seconds. If it's too hot for you, it's too hot for their paws.

Since exercise is behind the majority of heat stroke cases, one of the best things you can do isn't to stop exercising your dog. It's to change how they get that energy out.
Water is one of the best tools you have here. Swimming works muscles hard without spiking body temperature the way running does, and it doubles as active cooling. If your dog's new to it, here's how to teach your dog to swim, and if you're wondering where your dog can go swimming near you, that's worth a look before the next heat wave hits.
🐾 Skip the crowded public pool lines and give your dog a private place to cool off. Book a Sniffspot pool near you →
Even with windows cracked. Even "just for a minute." A car's interior temperature climbs fast, and limited airflow in a confined space pushes core body temperature to dangerous levels quickly, regardless of how mild it feels outside.
Know the early signs from the section above, and act the moment you see them. The dogs who recover fastest are almost always the ones whose owners caught it early.
🐾 Give your dog room to play and cool off without the chaos of a crowded park. Find a private Sniffspot near you →
If you suspect your dog is heading into heat stroke, the order you do things in actually matters. Veterinary researchers at the Royal Veterinary College put it simply: cool first, transport second. Cooling your dog down before and during the drive to the vet makes a real difference in outcomes, so don't skip straight to the car.
Skip the ice water and ice packs. Extremely cold water can constrict blood vessels near the skin's surface, which actually traps heat inside instead of releasing it, and can cause shivering that generates even more heat. Cool and lukewarm water work faster and safer than ice-cold.

Heat stroke is a genuine medical emergency, and it can cause internal organ damage that isn't visible from the outside. A dog who seems fine twenty minutes later can still be dealing with damage that needs monitoring. Your vet may recommend IV fluids, bloodwork, or observation depending on how severe the episode was.
Don't skip this step because your dog "seems okay now." Seeming okay and being okay aren't always the same thing after a heat stroke episode.
Let's take a look at some of the most frequently asked questions about heat stroke in dogs.
There's no single temperature that triggers heat stroke in every dog. Risk climbs with humidity, exertion level, and your dog's individual factors (breed, age, weight, coat). A humid 75-80°F day with exercise can be riskier for an at-risk dog than a dry 90°F day of rest in the shade. When in doubt, check pavement heat and humidity, not just the number on your weather app.
Yes, though it's less common. Shade lowers risk significantly but doesn't eliminate it, especially for brachycephalic breeds, senior dogs, or dogs sitting in a still, humid environment with no airflow. Shade plus a breeze or fan is much safer than shade alone.
It depends heavily on severity. Mild cases caught early may resolve within a day with rest and monitoring. Moderate to severe cases often require veterinary treatment and days of recovery, with follow-up bloodwork to check for organ damage. Always let your vet guide the recovery timeline rather than assuming your dog is fully in the clear once symptoms fade.
Yes. Veterinary research puts the fatality rate at roughly 14%, meaning about 1 in 7 dogs who develop heat stroke don't survive it. That's exactly why prevention and fast action matter so much more than trying to treat it after the fact.
Move them to shade or AC immediately, apply cool (not ice-cold) water to their neck, head, and paw pads, and add airflow from a fan if you have one. Offer small sips of water if they're willing to drink. Then get to a vet, don't wait to see if they recover on their own.
No. Every dog can develop heat stroke under the right (or wrong) conditions. Some breeds carry dramatically higher risk due to airway structure, coat type, or size, but a lean, average-muzzled dog can still overheat with enough exertion and heat.
Yes. About 13% of heat stroke cases in the VetCompass study involved no exercise at all, just prolonged exposure to hot or humid conditions. Senior dogs and brachycephalic breeds are especially vulnerable to this "just sitting outside" version of heat stroke.
It depends on humidity, pavement temperature, and your dog's individual risk factors more than the number itself. A dry, breezy 80°F morning is very different from a humid, still 80°F afternoon. Check out our full guide on how hot is too hot to walk a dog for a more precise read on your specific situation.
Heat stroke isn't just a hot-car problem, it's a during-your-normal-walk problem, which is exactly why so many cases catch owners off guard. The good news is that most of it is preventable once you know what actually drives the risk: exertion, heat, humidity, and your dog's individual factors like breed, age, and weight.
Know your dog's risk level, time your outings around the real heat of the day (not just the calendar), keep water and shade non-negotiable, and watch for the early signs before they become an emergency. And when in doubt, cool first, get to the vet second.
🐾 Want a cooler, calmer way to let your dog burn off energy this summer? Find a private Sniffspot near you →
At Sniffspot, all of our posts are vetted by training and vetrinary professionals. This guide was reviewed by Shannon Finch, AnimalKind Training, as well as Elisa Quinn, CVT, SEA Island Animal Clinic.
Sources:

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