Heatstroke in dogs: symptoms, causes and emergency treatment

Dogs are highly sensitive to heatstroke because their thermoregulation system is far less efficient than that of humans: they have barely any sweat glands and regulate their body temperature solely through panting. If your pet is in a critical situation due to high temperatures, you should know that time is the most vital factor in saving its life.

🚨 EMERGENCY: If your dog is panting uncontrollably, has bluish or dark red gums, walks unsteadily or is disoriented, call our emergency team right now at 942 51 00 66. Heatstroke is a serious medical emergency that can be fatal in less than 30 minutes.

⚠️ Warning signs: seek emergency care. If your dog shows any of these signs, do not wait and take it to a veterinarian immediately:

• Intense, uncontrolled panting, with thick saliva or constant drooling.

• Bluish, greyish or dark red gums and tongue.

• Vomiting or diarrhoea (sometimes with blood).

• Staggering, weakness, tremors or disorientation.

• Seizures, fainting or loss of consciousness (collapse).

First aid while you go to the vet

These guidelines serve only to stabilise the animal and lower its temperature on the way to the clinic; they never replace the care of a professional veterinarian:

1. Move it into the shade: take the dog immediately to a cool, well-ventilated, shaded place, and fan it or place it in front of a fan or air conditioner at moderate power.

2. Cool it down gradually: apply cloths dampened with lukewarm or room-temperature water to its head, neck, groin, armpits and paw pads. Never use cold water or ice.

3. Offer water without forcing: if it is conscious, give it fresh water at its own pace, without forcing it to drink or giving it ice-cold water.

4. Go to the vet: call 942 51 00 66 and take the animal in as soon as possible for a professional assessment.

What NOT to do in the event of heatstroke

Some well-meaning reactions can make things worse. Completely avoid the following:

• Do not use ice-cold water: a radical change in temperature can worsen the body's failure.

• Do not apply ice directly to the animal's skin.

• Do not force it to drink: forcing intake can cause choking and immediately worsen the situation.

• Do not wrap it completely in wet towels, as this traps the heat of its own body.

How long does it take a dog to recover from heatstroke?

There is no single timeframe: recovery depends directly on the severity of the case and on how quickly you act. Mild cases treated in time usually recover completely, while severe cases may leave chronic organ damage. In every case the animal needs a veterinary assessment and follow-up to confirm that it is regaining stability.

How to act in the event of heatstroke in dogs? Emergency home treatment

If you suspect your pet is suffering a crisis caused by high temperatures and you are looking for a home treatment for heatstroke in dogs, you must be perfectly clear that these first-aid guidelines serve only to stabilise the animal and lower its temperature on the way to the clinic, but they never replace the care of a professional veterinarian:

• Cool key areas gradually: Apply cloths or towels dampened with water at room temperature or lukewarm (never use cold water or ice) to its head, neck, groin, armpits and paw pads.

• Alcohol on the paw pads: Lightly dampen the area of its paw pads with a little alcohol; this helps speed up heat loss through evaporation.

• Provide constant ventilation: Fan it by hand or place it directly in front of a fan or air conditioner at moderate power to cool its surroundings.

• Controlled hydration without forcing: If the dog is conscious, offer it fresh water, but never force it to drink or give it ice-cold water. A radical change in temperature or choking from forced intake would immediately worsen the systemic failure. Nor should you wrap it completely in wet towels, as this traps the heat of its own body.

Symptoms of heatstroke in dogs: warning signs

Heatstroke is caused by an acute failure in the animal's thermoregulation system, resulting from a drastic rise in its internal body temperature. In order to apply first aid in time and prevent multi-organ damage, it is essential to immediately identify the clinical signs of hyperthermia:

• Hyperthermia: Internal body temperature above 40°C.

• Excessive panting: Very rapid, laboured breathing accompanied by thick saliva or constant drooling.

• Mucous membrane changes: Bluish, greyish or dark red gums and tongue due to a critical lack of oxygen in the blood.

• Loss of balance: Staggering, weakness, muscle tremors or inability to stand.

• Gastrointestinal disorders: Frequent vomiting and diarrhoea (sometimes bloody).

• Skin signs: Presence of petechiae (small red dots or spots of blood on the skin).

• Severe collapse: Fainting, episodes of seizures and, in the most serious cases, total loss of consciousness or coma.

“Heatstroke is a real emergency: recognising the first signs and acting quickly makes all the difference.”

Causes, situations and risk factors for heatstroke

Prevention is our greatest ally against this summer condition. To properly protect your companion, you should know the main situations and factors that trigger this thermal failure:

• The inside of vehicles on hot days: This is one of the most frequent and lethal causes. Inside a closed car the temperature rises at lightning speed, easily exceeding 40°C within minutes, even with the windows slightly lowered. Never leave your dog alone in the car!

• Exercise and overactivity during peak hours: Completely avoid long walks, training sessions or intense play under the sun during the hours of maximum thermal intensity (especially between 12:00 and 18:00).

• Pre-existing respiratory or cardiac conditions: Dogs suffering from heart failure or chronic lung conditions have a greatly reduced ventilation capacity, which makes them extremely vulnerable to heat collapse.

• Brachycephalic morphology (flat-faced dogs): Due to their anatomical characteristics (narrow nostrils, elongated soft palate and reduced larynx), breeds such as the French Bulldog, English Bulldog, Boxer, Pug, Shar Pei, Pekingese, Shih Tzu and Boston Terrier find it extremely difficult to dissipate heat through panting.

• Overweight and obesity: Excess body fat acts as a thermal insulator that prevents the body from releasing surplus heat, in addition to placing a drastic strain on the cardiovascular system.

• Extremes of age: Both puppies (whose immune and thermoregulation systems are still developing) and elderly dogs (who experience natural organic wear) are extremely sensitive to the effects of heat stress.

Request immediate clinical assistance in Cantabria

At the slightest sign of hyperthermia, or if after applying the first home first-aid measures you notice the animal is not recovering its stability, do not take any kind of risk. Heatstroke that is not treated in time triggers irreversible systemic organ failure within minutes.

At Clínica Veterinaria Somo we maintain a firm commitment to cutting-edge medicine and clinical excellence. Our professional team is fully prepared to handle complex emergencies and apply advanced supportive treatments immediately. If you are in the region and need help, contact us urgently at 942 51 00 66 or take your pet immediately to our reference centre located at Calle Isla de Mouro 7, Somo, Cantabria.

Assess each case with your vet; the right treatment depends on each animal's age, weight, health status and history.

Frequently asked questions about heatstroke in dogs

What symptoms does a dog with heatstroke have? The main symptoms are excessive panting, constant drooling with thick saliva, red, bluish or pale gums, vomiting, motor weakness, disorientation and, in severe cases, seizures or loss of consciousness. Act immediately if you observe these signs.

What should I do if my dog has heatstroke? Move the dog immediately to a cool, well-ventilated, shaded place. Apply damp cloths with room-temperature water (never ice-cold) to its neck, armpits and groin, offer it fresh water without forcing it to drink, and go urgently to a veterinary clinic.

How can heatstroke in dogs be prevented? Completely avoid walks and physical exercise during the hottest hours (from 12:00 to 18:00). Always provide fresh, clean water, keep the animal in cooled rooms, seek shaded areas and never leave it alone inside the car.

Is heatstroke in dogs fatal? Yes, it can be in less than 30 minutes if not treated in time. It is a critical veterinary emergency that requires immediate professional medical attention to stabilise the animal's vital signs and prevent irreversible damage to its vital organs.

What body temperature indicates heatstroke in a dog? The normal temperature of a healthy dog is between 38°C and 39°C. An internal body temperature above 40°C indicates severe hyperthermia. Exceeding 41°C constitutes a critical veterinary emergency that can cause irreversible multi-organ damage within minutes.

Can dogs recover from heatstroke? Yes, as long as they receive prompt and timely veterinary care. The final recovery depends directly on the speed of treatment, the maximum temperature reached by the body and the duration of heat exposure. Mild cases usually recover completely, while severe cases may suffer chronic organ damage.