It's one of the most common veterinary emergencies in summer, and yet one of the most poorly anticipated: heatstroke (hyperthermia) can kill a dog in under 30 minutes if not addressed in time. Unlike humans, dogs barely sweat — they regulate their temperature mainly through panting, which makes them far more vulnerable as soon as conditions become harsher.

High-risk situations

  • A parked car, even in the shade or with a window cracked open
  • Intense physical effort in high heat (canicross, training, transport)
  • Scorching ground (asphalt, sand) — paw pads suffer too
  • Brachycephalic breeds (Bulldog, Pug, Boxer...): narrower airways, less effective panting
  • Working dogs: mission instinct can push them to ignore their own warning signals

Recognizing the signs

Early signs: fast, noisy panting, excessive drooling, restlessness, seeking shade or water, bright red gums and tongue.

Severe signs (life-threatening emergency): panting that abruptly slows or stops, gums turning pale, grey or bluish, vomiting, diarrhea, staggering gait, disorientation, seizures or loss of consciousness.

At the very first early signs, act immediately — never wait for things to worsen.

The life-saving steps

  • Remove the dog from the heat source immediately (shade, air-conditioned vehicle, cool indoor space)
  • Cool it down gradually: lukewarm to cool water (never ice-cold — thermal shock can worsen the condition) on the body, particularly the belly, inner thighs and neck
  • Ventilate: moving air around the dog (fan, draft)
  • Offer water freely, but without forcing it
  • Monitor temperature if you have a suitable thermometer — goal: gradually bring it back down to 39°C
  • Consult a vet urgently, even if the dog seems to be stabilizing: internal complications (kidney, clotting) can appear several hours after the episode

What NOT to do

  • Never use ice water or ice directly on the skin (vasoconstriction = less effective cooling, risk of shock)
  • Do not force the dog to drink large amounts all at once
  • Do not consider the episode over simply because the dog "looks better"

Prevention for working and transport dogs

For professionals in the canine sector, prevention relies on:

  • Properly ventilated transport vehicles (temperature monitoring, active ventilation)
  • Regular breaks in the shade during exertion or travel
  • Adjusting schedules for training or missions to the cooler hours of the day
  • Permanent access to water, including during transport phases

Having a suitable first aid kit on hand — including a way to measure temperature, cool the dog down quickly, and stabilize it before transport to a vet — often makes the difference between a controlled episode and a life-threatening emergency.