Australian summers are beautiful, but they can also be brutal. When the temperature climbs past 30 degrees, we feel it! And our pups feel it far more intensely than we do. Heatstroke in dogs is one of the most preventable yet common emergencies we see at The House Call Vet, and it can unfold in a matter of minutes.
The truth is, dogs simply are not built to cool down the way we are. A shady backyard, a quick walk on the beach or even a short trip in the car can quickly turn dangerous. That is why recognising the early warning signs of heatstroke is one of the most important things you can learn as a dog owner.
In this guide, we will walk you through exactly what heatstroke is, how to spot the symptoms early, what to do in an emergency, and how to keep your dog safe through every scorching Aussie summer!
What Is Heatstroke In Dogs, And Why Does It Happen So Fast?
Heatstroke in dogs (also known as hyperthermia) is a life-threatening condition that occurs when a dog’s body temperature rises to dangerous levels and their natural cooling systems can no longer keep up.
There is an important difference between a dog who is simply warm and a dog who is in genuine distress. Overheating is the early stage, where your dog is uncomfortable but their body is still coping. Heatstroke is what happens when the body can no longer cool itself down. Once a dog’s internal temperature climbs above 40 degrees Celsius, their organs begin to struggle, and damage can start within minutes.
This is why heatstroke is always treated as an emergency, even if symptoms seem to come and go. The longer a dog’s body stays overheated, the greater the risk of lasting harm.
Quick Temperature Reference
- Normal dog body temperature: 37.5°C to 39.2°C
- Heatstroke threshold: above 40°C
- Critical emergency: 41°C and above
Why Dogs Overheat So Easily
One of the biggest misconceptions about dogs and hot weather is assuming they experience heat the way we do.
Unlike humans, dogs do not sweat through their skin. They have a small number of sweat glands in their paw pads, but these contribute very little to cooling. Instead, dogs rely almost entirely on panting to regulate their body temperature. When a dog pants, they are evaporating moisture from their tongue, nose, and lungs to release internal heat.
This system works well in mild conditions, but it starts to fail in hot, humid weather. When the air around your dog is already warm and moist, panting simply cannot shed enough heat to keep their body safe. Add in exercise, stress, or poor ventilation, and a dog can overheat quickly! This is why your dog might seem fine one moment and in distress the next.
Common Causes Of Heatstroke In Dogs
Heatstroke rarely happens out of nowhere. In most cases, there is a clear trigger. Being aware of these common causes is the first step in prevention.
- Being left in a parked car, even with the windows cracked. On a 29 degree day, the inside of a car can reach over 50 degrees within 10 minutes.
- Excessive exercise during warm weather, including long walks, runs, or fetch sessions in the middle of the day.
- Lack of access to shade or fresh drinking water while spending time outdoors.
- Hot, humid weather conditions that prevent panting from cooling the body effectively.
- Poor ventilation indoors, such as enclosed rooms that trap heat.
- Hot pavement, which not only burns paws but also radiates heat upward into the body.
Dogs Most At Risk Of Heatstroke
While any dog can develop heatstroke, some are far more vulnerable than others. If your dog falls into any of the categories below, extra caution is absolutely essential during warmer months.
Risk Category | Examples | Why They Are Vulnerable |
Flat-faced breeds | Bulldogs, Pugs, Boxers, French Bulldogs | Shortened airways limit their ability to cool through panting |
Senior dogs and puppies | All breeds | Their bodies are less efficient at regulating temperature |
Overweight dogs | All breeds | Excess body fat acts as insulation and traps heat |
Thick-coated breeds | Huskies, Malamutes, Samoyeds | Coats designed for colder climates can struggle in Aussie summers |
Dogs with heart or breathing conditions | Any breed | Existing health issues reduce the body’s coping ability |
Highly active or working breeds | Kelpies, Border Collies, Labradors | Driven personalities can push them past safe limits |
Early Symptoms Of Heatstroke In Dogs
Catching heatstroke in its early stages makes all the difference. The sooner you act, the better your dog’s chances of a full recovery! Here are the first warning signs every pet owner should watch for:
- Heavy or rapid panting that seems more intense than their normal breathing
- Excessive drooling, often thicker or stickier than usual
- Bright red gums or tongue, a sign that blood vessels are working overtime to release heat
- Restlessness or anxiety, pacing, or seeking cool surfaces to lie on
- Weakness, tiredness, or reluctance to keep moving during a walk or play
- Increased heart rate and a warm-feeling body, particularly the belly and ears
If you notice any of these symptoms, stop whatever activity you are doing and move your dog to a cool, shaded area straight away. Early action can prevent the situation from escalating.
Advanced Symptoms That Need Immediate Emergency Care
When heatstroke progresses beyond the early stages, your dog’s body begins to shut down. These symptoms mean you need to contact a vet immediately and begin emergency cooling on the way.
⚠ Emergency Warning Signs
- Vomiting or diarrhoea, sometimes with blood
- Collapse or inability to stand up
- Disorientation, stumbling, or appearing confused
- Seizures or uncontrolled muscle tremors
- Loss of consciousness
- Dark red, purple, or pale gums
If your dog is showing any of these signs, this is a true emergency. Do not wait to see if they improve. Contact The House Call Vet on your way to the clinic so we can prepare for your arrival.
How To Check If Your Dog May Be Overheating
If you are unsure whether your dog is just warm or genuinely in trouble, a quick three-point check can help you decide whether to act.
- Check their breathing. Is their panting heavier, faster, or louder than usual? Is it accompanied by visible effort or anxiety?
- Check their gums. Lift their lip gently. Healthy gums should be pink and moist. Bright red, dark, or pale gums are a red flag. Press lightly on the gum; it should return to pink within two seconds.
- Check their behaviour. Are they wobbly, unusually tired, confused, or unable to settle? Any sudden change in their normal energy levels or coordination warrants action.
If anything seems off, do not wait for more symptoms to develop. Start cooling your dog and contact your vet for advice.
What To Do If You Suspect Heatstroke
If you suspect heatstroke, fast and careful action can save your dog’s life. Follow these steps:
- Move your dog to a cool, shaded, or air-conditioned area immediately. Get them off hot surfaces like concrete or asphalt.
- Offer small amounts of cool (not cold) water to drink. Never force water into their mouth, as this can cause choking.
- Gently wet their paws, belly, ears, and underarms with cool water. You can use a damp towel or a gentle hose spray. Avoid ice-cold water.
- Use a fan or open windows to increase airflow, which helps evaporation do its job.
- Contact us straight away, even if your dog seems to be improving. Heatstroke can cause internal damage that is not visible from the outside.
🩺 Emergency? Call Us Now
If you suspect your dog is experiencing heatstroke, don’t wait! Contact us immediately or head straight to our clinic.
Every minute counts when it comes to heatstroke, and our team is ready to help.
What Not To Do During A Heatstroke Emergency
In a panic, it is easy to do too much, too quickly. Some well-meaning actions can actually make things worse. Keep these in mind:
- Do not use ice baths or freezing water. This causes blood vessels to constrict, which traps heat inside the body and can trigger shock.
- Do not force your dog to drink. Offer water, but let them sip at their own pace to avoid aspiration.
- Do not delay treatment if symptoms seem mild. Heatstroke can worsen rapidly, and internal damage may already be happening.
- Do not assume your dog will recover on their own. Even dogs that appear to bounce back need a veterinary check to rule out organ damage.
- Do not cover your dog with wet towels and leave them on. Trapped moisture acts as insulation. Wet them down, then let air circulate.
Here’s a few tips on how to stay calm: Staying Calm in a Pet Emergency
How We Treat Heatstroke In Dogs
When you arrive at the clinic, our team will move quickly to stabilise your dog. Veterinary treatment for heatstroke is far more thorough than home cooling, and it addresses both the immediate crisis and the potential internal effects.
Treatment typically begins with controlled cooling using cool (not cold) water, fans, and specialised techniques to safely bring body temperature down without causing shock. Intravenous fluids are administered to restore hydration, support circulation, and help the kidneys flush out toxins released during overheating.
Your dog’s body temperature, heart rate, breathing, and organ function will be closely monitored, often for several hours. In severe cases, bloodwork is used to check for clotting issues, kidney strain, or liver damage. Dogs who have experienced serious heatstroke may need to stay in hospital for ongoing observation, as complications can develop in the 24 to 72 hours following the event.
How To Prevent Heatstroke In Dogs
The best treatment for heatstroke is preventing it from ever happening. A few simple habits during warmer months can make all the difference for your dog’s safety and comfort.
- Walk your dog in the early morning or late evening when temperatures are cooler and pavement is safer.
- Always provide shade and multiple bowls of fresh water when your dog is outdoors.
- Do the pavement test. Place the back of your hand on the ground for seven seconds. If it is too hot for you, it is too hot for paws.
- Never leave your dog alone in a parked car, not even for a moment and not even with windows down.
- Avoid intense exercise, long hikes, or ball-chasing in hot conditions.
- Use cooling mats, pet-safe fans, or frozen treats to help your dog regulate their temperature indoors.
- Consider keeping flat-faced, senior, or thick-coated dogs indoors with air conditioning during heatwaves.
- Offer a shallow paddling pool in the backyard for dogs who enjoy water play.
When in doubt, ask yourself this simple question: if you would not be comfortable standing outside barefoot for twenty minutes, your dog should not be out there either.
Looking for more insight? We cover it here: Is it too hot outside for your pets?
Long-Term Effects Of Heatstroke
Many dogs recover fully from heatstroke when treatment is prompt, but a serious heat event can leave lasting effects. It can place significant strain on internal organs, particularly the kidneys, liver, and heart, and in some cases, it can also affect the nervous system and the blood’s ability to clot properly.
Recovery times vary. Mild cases may see your dog bouncing back within a day or two. More serious cases can require weeks of monitoring and follow-up bloodwork. Some dogs remain more heat-sensitive for life after a heatstroke episode, meaning prevention becomes even more crucial going forward.
If your dog has experienced heatstroke before, we recommend regular wellness checks and extra caution during summer. Our team can help create a tailored heat safety plan for your dog based on their breed, age, weight, and medical history.
Knowing The Symptoms Can Save Your Dog
Heatstroke in dogs is one of those emergencies where minutes truly matter. The pet owners who recognise the warning signs early, who trust their gut when something feels off, and who act quickly are the ones most likely to avoid a tragic outcome.
You know your dog better than anyone. If they seem to be struggling in the heat, listen to that instinct. Move them somewhere cool, start the cooling process, and pick up the phone. We would always rather reassure you over a false alarm than see a dog who waited too long.
At The House Call Vet, we are here to support you and your pup through every season. If you have any concerns about heatstroke, summer safety, or your dog’s health in general, please do not hesitate to get in touch with our friendly team.
Book A Summer Wellness Check
Worried your dog might be at higher risk of heatstroke? Book a wellness check with our team today! We can discuss breed-specific heat risks, weight management, and prevention strategies tailored to your pup.
Frequently Asked Questions
How quickly can a dog get heatstroke?
Dogs can develop heatstroke in as little as 15 to 30 minutes in hot conditions. In a parked car on a warm Australian day, it can happen even faster. This is why prompt recognition and action are so important.
What is a dog's normal body temperature?
A healthy dog’s body temperature sits between 37.5 and 39.2 degrees Celsius. Anything above 40 degrees is considered a medical emergency and requires immediate veterinary attention.
Can a dog fully recover from heatstroke?
Yes, many dogs make a full recovery when heatstroke is caught early and treated quickly. However, severe cases can cause lasting organ damage, which is why veterinary care is essential even when your dog seems to be improving.
What temperature is too hot to walk a dog in Australia?
As a general rule, once temperatures rise above 30 degrees Celsius, walks should be kept short, shaded, and scheduled for early morning or late evening. For flat-faced, senior, or overweight dogs, this threshold may be even lower.
Should I still see a vet if my dog seems to recover from heatstroke?
Absolutely. Internal damage from heatstroke is not always visible from the outside. A veterinary check can identify kidney strain, dehydration, or other complications that need ongoing monitoring or treatment.