Dogs in the heat - what really helps
Updated June 2026
The asphalt shimmers, the bowl is empty again, and the dog is suddenly not where the action usually is. In summer, everyday life can change faster than you think. A dog in the heat not only needs some shade but often a completely different daily rhythm – and owners who know at what body temperature it truly becomes dangerous.
In short: Dogs regulate heat much less effectively than humans because they can hardly sweat. The normal body temperature is 38-39°C. Heat exhaustion begins at 39.5°C, heatstroke is a risk at 41°C, and at 43°C, there is an acute danger to life. Early warning signs include heavy panting at rest, lethargy, and an unsteady gait. For heat exhaustion: lukewarm water on paws and belly. For acute heatstroke, however, according to the latest veterinary guidelines, rapid cooling with cold water is life-saving. Every dog with heatstroke must be taken to the vet immediately – even if they appear stable.
How a Dog Overheats in the Heat
A dog has almost no sweat glands. They can only evaporate some fluid from their paw pads – but this provides little cooling. The main mechanism for heat regulation is panting: with an open mouth and hanging tongue, the dog exhales warm air and inhales cooler air. Cooling occurs through the evaporation of saliva on the tongue.
This system works well – up to a point. Above outdoor temperatures of about 20°C, dogs begin to reduce their activity. Above 30°C, panting is often no longer sufficient, especially if high humidity further hinders evaporation. Then the body temperature rises. And from there, it becomes medically significant.
A dog's normal body temperature is 38-39°C – which is naturally higher than a human's. If it rises, the system enters three clearly defined stages:
| Body Temperature | What Happens | What to Do |
|---|---|---|
| 38-39°C | Normal | Nothing |
| 39.5-41°C | Heat Exhaustion | Cool immediately, inform vet |
| Above 41°C | Heatstroke – Organ function failure | Immediate rapid cooling and emergency vet |
| Above 43°C | Acute danger to life | Every minute counts |
These stages are not theoretical. They distinguish whether you still have time to cool calmly, or if you are in a medical emergency.
When Does Heat Become Dangerous for a Dog?
There is no general temperature limit, as several factors interact. Temperature alone says little when humidity, direct sun, asphalt, and activity are added. 24°C in the shade might be unproblematic for a young, fit dog – but 24°C in the city, with no air movement, after play and on hot ground, probably not.
Particularly at risk are:
- Brachycephalic breeds (Pug, Bulldog, Boxer, Pekingese) – their shortened airways make panting more difficult
- Seniors and puppies – poorer heat regulation
- Overweight dogs – more insulation, poorer heat dissipation
- Dogs with heart or respiratory problems
- Dogs with thick double coats (Husky, Bernese Mountain Dog, German Shepherd)
- Dark-colored dogs – heat up more in the sun
But even a healthy, normal-weight dog can overheat if the human applies their own standards. "I'm not that hot yet" is not a useful criterion. I don't believe in quickly doing the big round at midday because the dog is "otherwise not sufficiently exercised". In mid-summer, clever engagement matters more than distance.
Recognizing Early Warning Signs – Before It Becomes Critical
Many owners first think of complete collapse when it comes to overheating. It shouldn't get that far. In the early stages, heat often appears much less spectacular: the dog pants more heavily, slows down, seeks out tiles or shade, seems restless, or suddenly doesn't want to walk further.
A good early warning sign is the respiratory rate. In a normal state, a dog breathes 10-30 times per minute; large dogs tend to be slower, small ones a little faster. With incipient overheating, this frequency can increase dramatically – up to over 300 breaths per minute. If your dog doesn't stop panting even at rest, it's not a normal summer phenomenon.
Later, dark or bluish gums, glazed eyes, vomiting, staggering, seizures, or disorientation may occur. At that point, we're no longer talking about "a little warm" but a medical emergency.
Normally warm or already a warning sign?
The distinction is not always obvious in everyday life. A quick classification:
| Sign | Rather normal heat exposure | Warning sign |
|---|---|---|
| Panting | after activity, calms down quickly | very strong, continuous, even at rest |
| Respiratory rate | 10-30 per minute | significantly increased, frantic, shallow |
| Behavior | briefly seeks shade | appears lethargic, restless, or apathetic |
| Gait | normal | unsteady, staggering, swaying |
| Mucous membranes | pink | very dark red, pale, bluish, or dry |
| Saliva | slightly more than usual | thick, stringy saliva |
| Recovery after break | better after a few minutes | no clear improvement |
If you are unsure, it is better to treat the situation as an overreaction than an underreaction.
First Aid for Heat Exhaustion (39.5-41°C)
At the first warning signs, react quickly but don't overreact. The steps:
- Immediately get out of the sun, off the asphalt, and stop moving. Bring the dog to a cool, airy, shaded place.
- If possible, measure body temperature (rectally). This provides clarity on the stage.
- Apply lukewarm water (not ice-cold) to paws, inner thighs, belly, and chest area. Place damp towels on the neck, in the armpits, and between the hind legs.
- Offer water, but in small amounts and never force it. If the dog won't or can't drink, moisten the tongue with water.
- Call the vet and inform them that you are coming with an overheated dog.
For heat exhaustion, slow, controlled cooling is the method of choice. Ice-cold water additionally shocks the circulatory system and can trigger vasoconstriction, which paradoxically worsens heat dissipation.
First Aid for Acute Heatstroke (above 41°C)
Here it gets more serious, and a different rule applies than for heat exhaustion. For acute heatstroke, current veterinary guidelines recommend rapid, significant cooling with cold water. This is a correction to older recommendations – a British study showed that rapid cooling significantly increases the chance of survival.
Specifically, this means:
- Soak the fur with cold water, especially the belly, lower chest, armpits, inner thighs, and head.
- If a freshwater lake, pool, or stream is nearby: carefully allow the dog to enter.
- Simultaneously drive to the vet immediately or call an animal clinic.
- In case of unconsciousness: place in the recovery position on the right side of the body (relieves the heart), carefully stretch the head and neck, gently pull out the tongue to keep the airways clear.
Important: Even if you have stabilized the dog and it appears normal again, it must be taken to the vet. Heatstroke can cause complications that only appear hours later – cerebral edema, kidney damage, blood clotting disorders. Therefore, 24-48 hours of veterinary observation is necessary after every heatstroke, even if the dog appears recovered externally.
What you should definitely not do in the heat
- Leave your dog in the car – not even "just for a moment." At an outdoor temperature of 20°C, the car heats up to 46°C within an hour. At 30°C outside, over 60°C is reached inside the car. An open window is not enough.
- Pour ice water over the whole dog – it shocks the circulatory system during heat exhaustion. For acute heatstroke, rapid cooling with cold water is indicated.
- Force the dog to drink – this can lead to aspiration, meaning water entering the lungs.
- Continue activity because "the dog can still walk" – heatstroke can develop with a delay.
- Cool down on your own without veterinary clarification – even if everything looks okay externally.
Typical summer mistakes – and how to avoid them
Most problems arise not from malice, but from habit. One walks the usual route, at the usual pace, and realizes too late that summer has different rules.
These points are particularly critical:
- Walks in the midday heat
- Ball throwing or running on warm surfaces
- Cycling with the dog in the heat
- Waiting in the car, even "just for a moment"
- Too little water on the go
- Muzzle without good panting possibility
- Hot asphalt in the city
Hot ground is often underestimated. A good rule of thumb: If you yourself cannot stand barefoot on the asphalt for ten seconds, your dog's paws are in danger. Heated surfaces radiate heat upwards – the dog not only stands on heat, but also breathes it in. Paw burns from asphalt are regularly seen in German veterinary clinics every summer.
How to Adapt Daily Life with a Dog in Summer
Early mornings and late evenings are usually better times for exercise. In midsummer, it's best to walk before 8 am and after 8 pm, when the asphalt has cooled down. During the day, short potty breaks are sufficient; the rest can be quite uneventful.
What helps in summer:
- Prefer shady walking paths (forest, fields with trees)
- Sniffing games indoors or in a shaded garden – mental stimulation instead of physical
- Cooling mats for lying down – work without electricity due to gel filling
- Distribute several water bowls in the house, bring drinking water outside
- Keep cool rooms free – bathroom, hallway, basement are often good resting places
- Plan rest days, without a guilty conscience
Food is often secondary in extreme heat. Some dogs eat later or less. As long as the dog drinks, remains alert, and generally behaves normally, this is not a problem for now. For training or on-the-go snacks, small, dry bites are better than heavy or fatty rewards.
Myths about Dogs and Heat
Some half-truths persist. Here are the most common:
"A clipped dog is cooler." Not true for most breeds. Double-coated fur (Husky, German Shepherd, Bernese Mountain Dog) is a natural insulation that also protects against heat in summer. Clipping destroys this function. For long-haired breeds without an undercoat, sensible thinning can help, but complete clipping is usually harmful. Ask your groomer or vet.
"Ice water helps with cooling." For heat exhaustion, no – it shocks the circulatory system. For acute heatstroke, rapid cooling with cold water is now standard. The distinction is important.
"The dog needs less water if it eats less." False. Water is more important than ever in summer, regardless of food intake.
"If the dog voluntarily lies in the sun, it's not too warm." Also false. Some dogs love the sun, even if it harms them. You must intervene.
Frequently Asked Questions about Dogs in Heat
At what temperature is heat dangerous for dogs?
There is no fixed outdoor temperature as a limit. The combination of temperature, humidity, sun, surface, and activity is crucial. Even at 25°C, a summer day can be strenuous for some dogs, especially brachycephalic breeds, seniors, or overweight animals. Above 30°C, it becomes difficult for most dogs, and above 35°C, it is fundamentally critical.
What body temperature is dangerous for dogs?
The normal body temperature is 38-39°C. Heat exhaustion begins at 39.5°C, heatstroke with organ function failure is a risk at 41°C, and at 43°C, there is an acute danger to life. If you suspect heatstroke and have a thermometer: measure rectally; this provides clarity.
Can I walk my dog in the heat?
Yes, but differently than usual. Short walks, early or late, and without a sports program. If the dog lags, pants heavily, or seeks shade, it's not defiance but a clear message. In midsummer, it's better not to go out between 11 am and 6 pm, except for potty breaks.
How do I cool a dog down properly in the heat?
For heat exhaustion, use lukewarm water on paws, belly, and inner thighs. For acute heatstroke, use cold water, soaking the fur, especially the belly, armpits, and head. In both cases, inform the vet immediately.
Why does my dog pant so extremely in the heat?
Panting is the most important way for dogs to release body heat because they can hardly sweat. If it becomes very strong, prolonged, or occurs even at rest, this regulation may no longer be sufficient. A respiratory rate of over 30/min at rest is noticeable; with overheating, it can rise to 300+/min. Then you must immediately stop exertion and cool the dog.
How long can a dog stay in the car in summer?
Not at all. Not even "just five minutes." At an outdoor temperature of 20°C, a parked car heats up to 46°C within an hour; at 30°C outside, 60°C or more is reached. An open window is not enough. If you are traveling with your dog in summer and need to make stops, one person should stay in the air-conditioned car, or you all go in together.
Does clipping help against heat?
For most breeds, no. Double-coated fur also insulates against heat. Clipping can even irreversibly damage the coat. For long-haired breeds without a dense undercoat, careful thinning might be useful. Discuss this with a groomer or vet beforehand.
If you're looking for small, well-tolerated training treats in summer, monoprotein training cubes are a practical option – minimal crumbs, quickly given, and lean enough not to add extra burden in the heat.
A dog in the heat often initially just seems "off." That's what makes it tricky. Those who take small changes seriously usually spare their dog a major escalation.
Kathrin is the founder of Dogvanture and writes here about nutrition, behavior, and everyday life with dogs – honestly, without jargon. This article does not replace veterinary advice. In case of acute suspicion of heatstroke, always contact a veterinarian or emergency veterinary service immediately.
Sources: German Kennel Club (VDH), Veterinarian Dr. Hölter, felmo Dog Guide, Zooroyal Magazine, Dr. Michling Veterinary Practice, British study on Cooling Methods in Dogs (2016-2018).