If you suspect dog heatstroke, stop all activity, move your dog away from heat, begin cooling immediately with water and a breeze, and arrange urgent transport to the nearest vet. Cool first, transport secondā€”but call ahead as soon as help is available. Do not wait for collapse, and do not assume your dog is safe because they appear to recover.

Heatstroke can cause rapid organ damage and death. Home first aid is only the first step. Every suspected case needs immediate veterinary assessment, even when symptoms improve.

Emergency steps: what to do if your dog has heatstroke

1. STOP further heating

  • Stop exercise and keep movement to the minimum needed for safety.
  • Remove your dog from a hot vehicle, building, yard or direct sun.
  • Move into shade with airflow or a cooled indoor space.
  • Ask someone else to call the nearest veterinary clinic while you begin cooling.

2. COOL immediately

  • Pour or spray water cooler than your dog over the body, focusing on the neck, stomach and thighs.
  • Avoid the head, nose and mouth so water does not interfere with breathing.
  • Use a fan or create a breeze to increase heat loss.
  • If immersion is considered for a conscious, otherwise healthy dog, keep the head and airway above water and maintain full control. Never immerse an unconscious dog, and use room-temperature water spraying instead for an elderly dog or one with health conditions.
  • Do not delay cooling while searching for ice, a thermometer, a special product or an exact water temperature.

3. TRANSPORT to a vet

  • Call ahead and describe the heat exposure, symptoms and cooling already started.
  • Transport in a cooled, well-ventilated vehicle as soon as practical.
  • Continue safe cooling without covering the dog in wet towels or obstructing airflow.
  • Offer water only if your dog is fully conscious, able to swallow and interested. Never force water into their mouth.

These steps follow the RSPCA principle ā€œcool first, transport secondā€. They do not mean delaying veterinary contact or finishing a fixed cooling routine before leaving. Use available help to cool and arrange transport in parallel.

Recognise the warning signs early

Dogs cool themselves mainly through panting and heat exchange with their environment. When heat gain exceeds heat loss, body temperature can rise to dangerous levels. Panting after exercise is not automatically heatstroke, but changes in breathing, behaviour and coordination after heat exposure must be taken seriously.

Possible warning signs Severe or advanced signs
Relentless or unusually heavy panting Severe breathing distress
Drooling or thick saliva Vomiting or diarrhoea, possibly with blood
Restlessness or agitation Confusion, disorientation or delirium
Very red or pale gums or tongue Staggering, profound weakness or inability to stand
Faster heart or breathing rate Muscle tremors or seizures
Weakness or unusual lethargy Collapse, unconsciousness or coma

Do not wait for every sign to appear. ā€œMild heatstrokeā€ is not a safe home diagnosis. A dog that is deteriorating, struggling to breathe, vomiting repeatedly, disoriented or collapsing needs emergency action now.

RSPCA Australia emphasises that heatstroke can lead to rapid multi-organ failure and death. It can also occur in cooler conditions when exercise, transport, poor airflow or individual risk factors prevent adequate cooling.

What not to do

Well-intended actions can waste time or create another emergency.

  • Do not wait to see whether your dog recovers on their own.
  • Do not cover your dog with wet towels. Use water on the body plus moving air instead.
  • Do not pour water over the head or force water into the mouth. A distressed dog may inhale it.
  • Do not immerse an unconscious dog or any dog whose airway you cannot protect.
  • Do not give human medicines or home remedies. They do not treat heat-related organ injury and may be harmful.
  • Do not delay transport to take repeated temperature readings. Veterinary teams need to assess temperature, breathing, circulation and organ effects together.
  • Do not use a cooling mat, frozen treat or air-conditioning as a substitute for first aid and veterinary care.

Current veterinary guidance has changed over time, including advice about cold-water cooling. The safest practical priority is to start appropriate cooling with available water while protecting the airway and arranging urgent veterinary care. Follow the emergency clinicā€™s instructions for your dog.

How to cool a dog that is overheating

If your dog is simply warm after activity but remains bright, responsive and free of heatstroke signs, stop activity, move somewhere cooler, offer water and use cool water plus a breeze. Monitor closely.

The boundary between routine cooling and an emergency is not something to guess from one symptom. Treat relentless panting, breathing distress, vomiting, diarrhoea, marked lethargy, confusion, staggering, seizures or collapse as suspected heatstroke.

For prevention before hot weather, use our Australian dog summer-safety guide to plan walks, shade, water, travel and indoor activity.

If your dog was trapped in a hot car

Remove the dog from the vehicle as soon as it is safe and lawful to do so, begin cooling and contact a vet. A parked car can become dangerous rapidly, even on a mild day or with windows partly open.

If you have found someone elseā€™s dog in distress, contact local emergency services or the relevant animal authority immediately and follow their instructions. Reporting arrangements and the legal authority to enter a vehicle vary across Australia. Stay focused on getting qualified help rather than delaying to search social media or generic advice.

Record the location and observable condition if you can do so without delaying assistance. Do not put yourself or the animal at further risk.

Why your dog still needs a vet after apparent recovery

Cooling may improve outward signs before internal injury becomes obvious. Heatstroke can affect the brain, heart, kidneys, liver, gastrointestinal tract and blood-clotting system. Some complications develop later.

A veterinary team may assess vital signs, hydration, oxygenation, blood glucose, clotting and organ function, then provide cooling, intravenous fluids, oxygen, medication or ongoing monitoring as required. The exact treatment depends on the dog and severity.

Tell the clinic:

  • when and where the overheating occurred;
  • whether exercise, a vehicle or confinement was involved;
  • the first signs you noticed and when they began;
  • what cooling you used and for how long;
  • whether your dog vomited, collapsed, had a seizure or lost consciousness;
  • any existing illness or medication; and
  • whether your dog has flat-faced anatomy or previous breathing problems.

Do not invent a timeline if you are unsure. Approximate, honest information is more useful than a precise guess.

Recovery and the days after heatstroke

There is no universal recovery time. Duration depends on heat exposure, cooling, treatment and organ injury. Follow the discharge plan exactly, including rest, medication, food and water instructions, repeat blood tests and review appointments.

Keep your dog in a cool, quiet environment and avoid exercise until the veterinary team says it is safe. Ask which changes require an urgent return, such as worsening lethargy, vomiting, diarrhoea, breathing changes, reduced urination, pale or yellow gums, bleeding, collapse or seizures.

Do not assume that a normal-looking day cancels later risk. Contact the clinic if anything concerns you, even if it is not on the discharge list.

Dogs that need extra prevention

All dogs are vulnerable. The margin for error may be smaller for:

  • flat-faced breeds and dogs with airway disease;
  • puppies and senior dogs;
  • dogs with obesity or thick coats;
  • dogs with heart, respiratory or neurological conditions;
  • dogs not acclimatised to current conditions; and
  • dogs confined, transported or exercised without suitable shade, airflow and water.

Ask your vet for an individual warm-weather plan. Indoor, low-impact activities can replace risky outdoor sessions; our dog enrichment guide offers practical options.

Save the emergency card before you need it

During an emergency, searching for instructions costs time. Save the three-step sequence and your local veterinary contacts now:

  1. STOP: activity, direct sun and further heat exposure.
  2. COOL: water on the body, away from the airway, plus a breeze.
  3. TRANSPORT: call ahead and travel to the nearest vet in a cooled, ventilated vehicle.

Download: Keep Zookieā€™s dog heatstroke emergency card with your pet-care information. It is a prompt for first aid and veterinary contact, not a substitute for emergency treatment.

Frequently asked questions

What are the first signs of heatstroke in dogs?

Possible early signs include relentless panting, drooling, restlessness, very red or pale gums, increased heart or breathing rate, weakness and unusual lethargy. Vomiting, diarrhoea, confusion, staggering, seizures and collapse indicate severe danger. Start cooling and contact a vet without waiting for advanced signs.

Can I treat dog heatstroke at home?

You can and should begin first aid immediately, but you cannot safely complete heatstroke treatment at home. Stop further heating, cool with water and a breeze, and arrange urgent veterinary transport. Organ injury can continue even after outward improvement.

Should I use ice or cold water for dog heatstroke?

Do not delay cooling to find ice or achieve a particular water temperature. Pour or spray available water cooler than the dog over the body, avoid the head and create a breeze. Never immerse an unconscious dog or one whose airway cannot be protected. Follow the emergency vetā€™s instructions for your dog.

How long does it take for an overheated dog to cool down?

There is no safe universal timeframe. The starting temperature, cause, dog and cooling method all vary. Do not delay veterinary transport while watching the clock or repeatedly taking temperatures.

Can a dog have heatstroke without collapsing?

Yes. Collapse is a severe sign, not a requirement for diagnosis. Heavy relentless panting, drooling, vomiting, disorientation, weakness or breathing distress after heat exposure can occur before collapse and need urgent action.

Can heatstroke affect a dog days later?

Yes, complications involving organs or blood clotting can appear after the initial event. Veterinary assessment and the recommended follow-up are essential even if your dog seems better. Contact the clinic promptly about any new or worsening signs.

Does a normal temperature mean my dog is okay?

Not necessarily. Temperature is only one part of assessment, and cooling before arrival can change the reading. Your dog still needs veterinary evaluation after suspected heatstroke.

Sources

General first-aid information only. A registered emergency veterinarian must review the published article. Suspected heatstroke always requires immediate veterinary attention.