Recognizing and responding to heat stroke in dogs.

Dr. Nina Burger, BVSc

Heatstroke is a severe, life-threatening condition that can progress with alarming speed. Because dogs cannot sweat like humans, they rely almost entirely on panting to release excess body heat. When environmental temperatures soar or ventilation is restricted, a dog's natural cooling mechanisms can fail, leading to rapid hyperthermia and multi-organ dysfunction.

While any animal can suffer from heatstroke, certain pets face a drastically elevated risk during warm weather. Brachycephalic breeds with short noses or flat faces, such as Bulldogs, Pugs, and Boxers, often have narrow windpipes and restricted airways that make it exceptionally difficult to cool down through panting. Similarly, thick-coated breeds naturally built for cold climates, like Siberian Huskies, easily trap internal heat. Beyond breed characteristics, environmental and activity factors play a huge role - leaving any pet locked inside a parked vehicle (even for a few minutes or in the shade) can quickly prove fatal, while taking dogs on long walks or strenuous runs in direct sunlight during warm days can rapidly trigger heat stress.

Early recognition is critical to saving a dog's life. A pet experiencing heatstroke will typically present with the following signs:

• Extreme, Frenzied Panting: Unusually rapid or heavy breathing as they attempt to release heat.

• Hypersalivation: Excessive drooling or thick, sticky saliva.

• Darkened Gums: Mucous membranes in the mouth turning dark red, purple, or muddy.

• Neurological Distress: Heatstroke can affect the central nervous system, leading to brain swelling. This can cause unsteady walking, seizures, coma, or permanent neurological impairment.

The longer a dog's internal body temperature remains elevated, the higher the risk of permanent organ damage or death. Initial cooling measures should begin at home before and during transport to the clinic. Cool the dog by spraying them down with cool water. Avoid using ice-water baths or ice packs as extreme cold causes surface blood vessels to constrict, which actually traps heat inside the body's core and can induce shivering, generating even more internal heat. Gentle massaging can help increase blood flow to the skin to aid cooling. During transport to the veterinary hospital, drive with all car windows fully open to promote air circulation and convective cooling.