Heatstroke in Dogs: How to Spot It and What to Do Fast

Updated 23 September 2026 · 5 min read · Reviewed by the Joey AI team

Quick answer

Heatstroke is an emergency that happens when a dog's body overheats and cannot cool down. Signs include heavy panting, drooling, bright red gums, weakness, vomiting and collapse. Start cooling your dog with cool water at once and contact a vet, even if your dog seems better after cooling.

See a vet now if:

Heavy panting that does not slow down, or trouble breathing
Bright red, dark red or blue gums and tongue
Weakness, stumbling or collapse
Vomiting or diarrhoea
Seizures, tremors or disorientation
Body temperature over 40°C (104°F)
Unconsciousness or not responding to you

What Is Heatstroke in Dogs

Heatstroke, also called hyperthermia, happens when a dog's body temperature climbs too high and the body cannot cool itself. A normal dog's temperature is between 38 and 39.2°C. When it rises above 40°C, organs begin to fail. This is a life-threatening emergency.

Dogs do not sweat like we do. They cool down mainly by panting and through the pads of their paws. In India's hot and humid weather, especially during summer and the weeks before the monsoon, panting alone is often not enough. Flat-faced breeds such as Pugs, Bulldogs and Shih Tzus struggle even more because their short airways make breathing and cooling harder.

Heatstroke can happen outdoors in direct sun, in a parked vehicle, during exercise in the heat, or even at home if the air is hot and there is no ventilation or shade.

Warning Signs of Heatstroke in Dogs

Recognising heatstroke early can save your dog's life. The first signs are often heavy, frantic panting and excessive drooling. As the condition worsens, you may see the following.

Bright red, dark red or pale gums and tongue
Thick, sticky saliva
Rapid heart rate
Vomiting or diarrhoea, sometimes bloody
Weakness, wobbling or inability to stand
Glazed eyes or confusion
Seizures or muscle tremors
Collapse or loss of consciousness

Some dogs seem to improve briefly after you start cooling them, but internal damage can still be happening. Always see a vet even if your dog looks better.

Still unsure what's going on?If you are unsure whether your dog is showing signs of heatstroke or you want advice for your dog's specific situation, describe what you are seeing to Joey AI for guidance on next steps.

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What to Do Immediately If Your Dog Has Heatstroke

Heatstroke is an emergency. Your goal is to cool your dog gradually and get veterinary help as quickly as possible. Do not wait to see if your dog recovers on its own.

Move your dog to a cool, shaded place or indoors with a fan or air conditioning.
Offer small amounts of cool, not ice-cold, water if your dog is alert and able to drink. Do not force water.
Pour or spray cool water over your dog's whole body and keep going. Focus on the neck, armpits, groin and belly. Cool tap water is safe and cools fastest, so do not waste time looking for ice.
Place a damp towel under your dog, and keep wetting it. Do not wrap your dog completely in a wet towel, as it can hold heat in.
If possible, place your dog in front of a fan to help evaporation.
Contact a vet immediately and tell them you are on the way. Time matters, and the vet may prepare equipment or fluids in advance.

Stop cooling once your dog's temperature drops to about 39.4°C if you are checking at home, or after 10 to 15 minutes of cooling if you do not have a thermometer. Over-cooling can cause other problems. Then go straight to the vet.

How Vets Treat Heatstroke

At the clinic, the vet will check your dog's temperature, heart rate, breathing and hydration. Treatment may include intravenous fluids to restore circulation and blood pressure, oxygen if breathing is poor, and medication to control vomiting, seizures or organ damage.

The vet may run blood tests to check kidney and liver function, clotting ability and electrolyte levels. Heatstroke can cause damage that shows up hours or even days later, so some dogs need monitoring or hospitalisation.

Recovery depends on how high the temperature went, how long the dog was overheated, and how quickly cooling and treatment began. Dogs treated early have a much better chance.

Preventing Heatstroke in Indian Weather

Prevention is far easier and safer than treatment. Most cases of heatstroke can be avoided with simple precautions, especially during India's summer months and in hot, humid conditions.

Walk your dog early in the morning or after sunset when roads and air are cooler. Hot tarmac and concrete can burn paws and reflect heat upward.
Always carry water and a bowl on walks. Offer water every 15 to 20 minutes during warm weather.
Never leave your dog in a parked car, even for a few minutes with windows open. Temperatures inside climb dangerously fast.
Provide constant access to shade and fresh water at home. Indoor dogs need ventilation, a fan or air conditioning during heat waves.
Avoid heavy exercise in hot or humid weather. Flat-faced breeds, overweight dogs, puppies, seniors and dogs with heart or lung problems overheat faster.
If your dog scavenges during walks, keep them on a short lead near food waste. Eating spoiled food and then overheating raises the risk of vomiting and complications.
Consider a cooling mat or damp towel for your dog to lie on indoors during the hottest part of the day.
Be extra cautious with thick-coated breeds such as Huskies or Saint Bernards, which are not suited to India's climate.

If your dog has had heatstroke before, they are more vulnerable in the future. Take prevention even more seriously, and speak to your vet about managing exercise and heat exposure.

Frequently asked questions

Can a dog recover from heatstroke at home without seeing a vet?

No. Even if your dog seems to recover after cooling, heatstroke can cause internal organ damage that shows up hours later. Kidney failure, bleeding disorders, brain swelling and shock can all develop after the dog appears stable. Always see a vet immediately, even if your dog looks better.

How long does it take for a dog to get heatstroke?

It can happen within 15 to 30 minutes in very hot conditions, especially in a parked car, during exercise in the sun, or for flat-faced breeds. High humidity makes it worse because panting becomes less effective. Some dogs overheat faster due to age, weight, coat or health problems.

Can I give my dog ice or ice water to cool them down?

No. Ice or ice-cold water can cause blood vessels near the skin to narrow, trapping heat inside the body and making heatstroke worse. Use room-temperature or lukewarm water instead, and wet the body gradually. Let your dog drink cool water if they are alert, but do not force it.

Which dog breeds are most at risk of heatstroke in India?

Flat-faced breeds such as Pugs, Bulldogs, Boxers, Shih Tzus and Pekingese are at highest risk because their short airways make panting less effective. Thick-coated breeds, overweight dogs, seniors, puppies and dogs with heart or lung disease also overheat more easily. Indian Pariah Dogs generally cope better with heat.

What temperature is too hot to walk my dog?

If the pavement is too hot for you to hold the back of your hand on it for seven seconds, it is too hot for your dog's paws. As a general rule, avoid walks when the temperature is above 32°C, especially if humidity is high. Walk early morning or late evening instead.

Can heatstroke cause long-term damage in dogs?

Yes. Heatstroke can cause permanent damage to the kidneys, liver, heart, brain and gut. Some dogs develop chronic kidney disease, bleeding problems or neurological issues. Dogs that are treated quickly and fully have a better chance of full recovery, but long-term effects are possible.

This guide is general information to help you decide what to do next. It is not a diagnosis and does not replace an examination by a veterinarian. If your dog seems very unwell, contact a vet or an emergency animal hospital straight away.

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