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How to Avoid Heat Stroke in Dogs

Here in Australia we love our summers. Hot sunny days, beaches and barbeques are part of our identity. As we all know from a day spent too long in the sun, it’s definitely possible to have too much of a good thing. This applies to our pets too, and the most devastating consequence of warm weather is heat stroke. 

Although vets can treat affected pets if they're seen early enough, dogs sadly die from heat stroke every summer. The simple summary below will help you keep your furkids comfortable, safe and chilled out when the mercury rises.


A dog’s normal core body temperature sits around 38.5°C. Heat stroke, or hyperthermia, is defined as a severe increase in body temperature up to 40.5°C – 43°C caused by elevated ambient temperatures and/or strenuous activity. 

Dogs can’t sweat to cool themselves like us, and as their body gets hotter, a dog’s normal adaptive cooling mechanisms like panting and increased blood flow to the skin stop working. 

Blood pressure drops and along with it so does the blood supply to vital organs. This can result in widespread organ damage, severe illness and even death.


Any dog can overheat, but some are more susceptible than others. 

Seniors and the very overweight have more difficulty regulating their body temperature than healthy adult dogs. 

Those that are unwell are easily affected, particularly if they have a problem such as vomiting, diarrhoea or kidney disease that leads to dehydration. Dogs with very thick warm coats who were bred to live in colder climates may struggle, and a summer haircut may be in order. 

The most common group of dogs seen by vets for heat stroke are those known as brachycephalic breeds. These are the dogs with shorter snouts, such as Pugs and Bulldogs (e.g. the popular Frenchies). These guys are very cute, but they have significant problems with their airways and overheat very quickly. It’s vitally important to keep these dogs cool on hot days.


    Signs may vary between animals, but they commonly include: 
    • Incessant panting (increases as heat stroke progresses)
    • Drooling, salivating
    • Agitation, restlessness
    • Very red or pale gums
    • Bright red tongue
    • Increased heart rate
    • Breathing distress
    • Vomiting, Diarrhoea (possibly with blood)
    • Signs of mental confusion, delirium
    • Dizziness, staggering
    • Lethargy, weakness
    • Muscle tremors 
    • Seizures
    • Collapsing and lying down
    • Little to no urine production
    • Coma


    #1. Keep dogs indoors with air-conditioning on and fresh drinking water during very hot days.

    #2. For those outdoors, ensure adequate access to a shady, well-ventilated area all day and that there is plenty of cool, clean drinking water available. Provide multiple sources in case a bowl gets knocked over. 

    #3. Many dogs will love a kiddie ‘clam shell’ pool filled with water. They can hop in for a splash and have an extra source of drinking water that is unlikely to spill or run out.

    #4. Avoid exercise during the day. Not only are dogs likely to overheat if exercised during the hottest part of the day, but surfaces will be hot enough to burn paws. Early morning or late evening walks when the weather is cool are best.

    #5. Keep coats well-groomed and short. Long matted fur is not only uncomfortable but will trap heat making it harder to cool down.

    #6. Frozen treats, prepared the night before, are great for dogs. Throwing a few ice cubes into drinking water will also help to keep it cool and refreshing

    #7. Very importantly, never, ever leave your pet alone in a parked car. Even if it’s ‘not that hot’ outside, and even if the windows are down, it can still easily get hot enough to endanger life. The RSPCA advises that it can take just six minutes for a dog to die of heatstroke when left in a car.


    If you think your dog has heat stroke, you need to get to a vet as soon as possible. Even if they appear to recover, there may be internal damage that takes days to become obvious.

    There are some immediate steps you can take at home to help.

    1. First of all, remove the heat source if possible. If out in the sun, get them inside, in the shade and/or air conditioning. 

    2. The next thing we want to do is cool them down

    There are a number of ways to achieve this:
    • You can pour cool water over them
    • Spray them (gently) with a garden hose
    • Immerse them in cool water (but not if they are collapsed or struggling to breathe) or
    • Drape them with wet towels
    • Using a fan to help dissipate heat by convection can also be beneficial. 
    • With any method of cooling, use tepid or cool water, but NOT ice or iced water. Extreme cold can cause the blood vessels in the skin to react by constricting, and this will cause core body temperature to rise even further. 
    • Ideally check your dog’s temperature every 10 – 15 minutes

    3. If the temperature has dropped below 39.5°C, stop cooling them immediately. From there on, their temperature can drop rapidly and we don’t want it to go too low. 
    Offer a drink of water but please don’t force them to drink.

    4. If your dog is too severely affected to attempt cooling at home, for example if he is collapsed or having seizures, throw a wet towel over him, get him into the car, crank up the air con and drive straight to your nearest vet

    Please note: even if you think you have averted a crisis and your dog appears to be fine you should still see your vet. Despite looking good on the outside, life-threatening complications such as blood clotting problems, organ damage or brain swelling may be quietly brewing.

    Dr Joanna Paul is a Melbourne-based veterinarian who has been working in partnership with pet parents to care for their furry kids for over a decade.

    As well as work, she divides her time between her gorgeous dog Billy, a menagerie of other furkids, three children and her own website Creature Clinic for pet parents.
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