Heatstroke in dogs — first aid and prevention in summer

Heatstroke in Dogs: Symptoms, First Aid and Prevention [2026 Guide]

What is heatstroke in dogs?Golpe de calor en perros — primeros auxilios y prevención

Heatstroke (hyperthermia) is one of the most common veterinary emergencies in summer. It occurs when a dog's body temperature exceeds 40-41 C and the body cannot dissipate heat fast enough. Unlike humans, dogs only sweat through the pads of their paws and regulate their temperature mainly by panting, making them far more vulnerable to extreme heat.

In Spain and across Southern Europe, with temperatures exceeding 40 C in many regions during July and August, heatstroke can be fatal within minutes. Knowing the symptoms and how to act can save your dog's life.

Which breeds are most vulnerable?

  • Brachycephalic breeds (Bulldog, Pug, Boxer, Shih Tzu): their facial anatomy makes breathing and heat dissipation harder.
  • Long-haired or double-coated breeds (Husky, Samoyed, Golden Retriever): their coat retains more heat.
  • Puppies and senior dogs: their thermoregulation is less efficient.
  • Overweight dogs: excess fat acts as thermal insulation.
  • Dogs with heart or respiratory conditions: they have less capacity to compensate.

Symptoms of heatstroke in dogs

Mild symptoms (early stage)

  • Excessive, rapid panting
  • Heavy drooling
  • Restlessness or agitation
  • Body temperature between 39.5 and 40.5 C
  • Seeking cool surfaces to lie on

Severe symptoms (emergency)

  • Bright red or purple gums and tongue
  • Vomiting and diarrhoea (sometimes with blood)
  • Extreme weakness, staggering or inability to stand
  • Seizures
  • Loss of consciousness
  • Body temperature above 41 C

If your dog shows severe symptoms, go to an emergency vet immediately while applying first aid.

First aid: what to do if your dog has heatstroke

  1. Move them out of the heat - Take them to a cool, shaded place or air-conditioned room.
  2. Wet their body with cool (not cold) water - Use tap water at room temperature. Focus on the neck, armpits, groin and paw pads.
  3. Fan them - Use a fan or the car's air conditioning to speed up evaporation.
  4. Offer fresh water - If they are conscious and able to drink, let them do so in small amounts.
  5. Take their temperature - Check every 5 minutes. Once it drops below 39.5 C, stop cooling to avoid hypothermia.
  6. Go to the vet - Even if they seem to recover, heatstroke can cause internal damage. A vet check is essential.

What NOT to do: Do not use ice-cold water or ice directly on the skin. Do not wrap them in wet towels. Do not give ibuprofen or paracetamol - these are toxic to dogs.

How to prevent heatstroke in dogs

1. Adjust walk times

Avoid going out between 12:00 and 18:00. Walk early morning (before 9:00) or at dusk (after 20:00). For evening walks, the LED Luminous Dog Collar from DOGS & KATY keeps your dog visible and safe in the dark.

2. Constant hydration

Make sure your dog always has fresh water available, both at home and during walks.

3. Never leave them in the car

A car parked in the sun can reach 70 C in minutes. Never leave your dog alone in the car in summer.

4. Proper grooming

A clean, well-brushed coat allows better air circulation. The Dog & Cat Grooming Glove from DOGS & KATY removes dead hair that blocks skin ventilation.

5. Use a harness instead of a collar on hot days

The Adjustable Dog & Cat Harness from DOGS & KATY distributes pressure evenly and allows freer breathing.

Frequently asked questions

How quickly can a dog die from heatstroke?

Severe heatstroke can be fatal within 15-30 minutes if no action is taken.

Can a dog fully recover from heatstroke?

Mild cases usually resolve without lasting effects. Severe cases can leave permanent kidney, neurological or clotting damage.

Can cold water kill a dog with heatstroke?

Very cold water can cause peripheral vasoconstriction. Always use cool tap water, not ice-cold water.

Can I give my dog ice in summer?

Small amounts of ice in water are safe. Do not apply ice directly to the skin of a dog with heatstroke.

Can short-haired dogs also get heatstroke?

Yes. All dogs can suffer heatstroke if exposed to extreme temperatures without hydration or rest.

Summary: 5 key points for this summer

  1. Know the symptoms: excessive panting, red gums, weakness.
  2. Act fast: cool water, shade, vet.
  3. Walk at cool times: before 9am or after 8pm.
  4. Always hydrate: fresh water available at all times.
  5. Regular grooming: clean coat for better ventilation.

At DOGS & KATY you will find everything you need to keep your dog safe and comfortable this summer. Discover our collection.

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