Heatstroke in Dogs: How to Recognize It, Prevent It, and Act Fast in an Emergency

Heatstroke is one of the most serious emergencies that can affect dogs — especially during the hot season or when traveling.
Knowing the warning signs, causes, and how to respond quickly can truly make the difference between life and death.

In this guide, you’ll find everything you need to keep your dog safe, prevent heatstroke, and react promptly if it happens.

What Is Heatstroke in Dogs?

Heatstroke (or heat-induced hyperthermia) occurs when a dog’s body temperature rises above 41°C (normal is between 38.3°C and 39.2°C) and the body is no longer able to cool itself down.
This can lead to severe damage to vital organs — and, in extreme cases, be fatal.

Common Causes of Heatstroke

• Being left in a closed or poorly ventilated space (e.g. a parked car, a stuffy room)

• Prolonged exposure to direct sunlight

• Intense physical activity in hot weather (e.g. running, playing in the sun)

• High-risk breeds (e.g. brachycephalic dogs like bulldogs, pugs, boxers — they struggle to dissipate heat)

• Senior dogs or those with heart or respiratory conditions

Symptoms of Heatstroke in Dogs

• Recognizing symptoms early is critical. Watch out for:

  • Rapid, excessive panting

  • Thick, foamy drooling

  • Red or bluish gums

  • Weakness, trembling, or unsteadiness

  • Vomiting and diarrhea (sometimes with blood)

  • Disorientation, collapse

  • Seizures in severe cases

How to Prevent Heatstroke

• Never leave your dog in the car, even for a short time or with windows cracked open

• Avoid walks or intense activity between 11 a.m. and 5 p.m.

• Always provide access to fresh, clean water

• Ensure your dog has access to shade and air circulation

• Use well-fitted collars or harnesses that allow proper breathing and heat release

• Take extra precautions with at-risk breeds or older dogs

What to Do in Case of Heatstroke

1. If you suspect heatstroke, act immediately:

   1. Move your dog to a cool, shaded area

   2. Begin gradual cooling:

      • Use cool (not cold) water to wet the dog — focus on the neck, belly, armpits, and paws

      • Do not use ice or submerge the dog in ice water — this can cause shock

      • Use a fan to help speed up the cooling process

   3. Do not offer water or food if your dog is confused or unconscious (to avoid choking).
      If your dog is conscious, offer small amounts of room-temperature water

   4. Never give medication without veterinary advice

   5. Contact a veterinarian immediately, even if your dog starts to look better — internal damage may still occur

   👉 Avoid giving ice or frozen fruit — it can cause stomach cramps or breathing issues.

When to Call the Vet

Call your vet at the first sign of heatstroke, because:

• It can cause organ failure (kidneys, liver, brain)

• Fast action can save your dog’s life

• Only a vet can monitor temperature and provide appropriate treatment (IV fluids, oxygen, medication)

FAQ – Frequently Asked Questions

Can I leave my dog in the car with the window open?
No. Even with a window cracked, the temperature inside can rise dangerously fast.

Should I use cold or warm water to cool my dog down?
Use cool water at room temperature. Ice or very cold water can lead to thermal shock.

Can heatstroke happen at home?
Yes, especially in hot, unventilated rooms or for heat-sensitive breeds.

What if my dog vomits after overheating?
Contact your vet immediately. Vomiting may signal internal damage.

Heatstroke is serious — but entirely preventable with the right knowledge and awareness.

During summer or travel, follow the safety tips above.
If your dog shows any symptoms, intervene immediately and contact your vet.
Your prompt action could save their life.