Dog Heatstroke Symptoms: How to Recognize and Treat Heat Exhaustion in Dogs

Understanding how to quickly identify the signs of heatstroke can be the difference between a minor scare and a tragic loss. As temperatures rise during the summer months, pet owners must remain hyper-vigilant.

How Do Dogs Regulate Body Temperature?

Unlike humans, dogs do not have sweat glands distributed across their entire body. They possess a small number of merocrine sweat glands on their paw pads and noses, but these are wholly insufficient for cooling their core temperature on a hot day.

Instead, dogs rely primarily on panting. When a dog pants, moisture evaporates from their tongue, nasal passages, and the lining of their lungs. This evaporation process cools the blood vessels in their head and respiratory tract, which then circulates cooler blood back into their body. This system is effective in moderate weather but fails completely when the ambient air is heavily saturated with humidity or when the air temperature exceeds the dog's internal body temperature.

What Are the Early Warning Signs of Heat Exhaustion?

Recognizing heat exhaustion before it progresses to full-blown heatstroke is critical. If you are walking your dog and notice any of these signs, stop immediately:

• Excessive Panting: While panting is normal, frantic, heavy panting with a fully extended tongue is a sign of distress.
• Hypersalivation: Thick, ropy, or excessive drool occurs as the body attempts to generate more moisture for evaporation.
• Lethargy and Weakness: The dog may suddenly slow down, refuse to walk, or attempt to lie down on the pavement.
• Bright Red Gums: Lift their lip. If the gums are a dark, brick-red color, their blood pressure is rising dangerously.

What Are the Symptoms of Severe Heatstroke?

If early signs are ignored, the condition rapidly deteriorates into heatstroke. At this stage, cellular damage begins to occur, and the central nervous system becomes compromised. Symptoms include:

• Disorientation and Staggering: The dog may appear drunk, stumbling or unable to walk in a straight line.
• Vomiting and Diarrhea: The gastrointestinal tract begins to fail, often resulting in bloody diarrhea.
• Collapse or Seizures: The dog may fall over, become unresponsive, or experience muscle tremors and seizures.
• Blue or Pale Gums: A sign of shock and a lack of oxygenated blood reaching the tissues.

How Do You Treat a Dog With Heatstroke?

If you observe severe symptoms, do not panic, but act immediately. Heatstroke is fatal if left untreated.

1. Move to Shade or A/C: Get the dog out of the direct sun immediately. Carry them if necessary.
2. Cool Water, Not Ice: Pour cool (not freezing) water over their body, focusing on their belly, groin, and paws where blood vessels are close to the surface. Never use ice or ice water, as this causes blood vessels to constrict and traps heat inside the core.
3. Offer Drinking Water: Allow them to drink cool water if they are conscious and able to swallow, but do not force water down their throat.
4. Create Airflow: Use a fan, an air conditioning vent, or simply fan them with a piece of cardboard to accelerate evaporation.
5. Go to the Vet: Even if the dog appears to recover, you must take them to an emergency veterinary clinic. Heatstroke can cause delayed organ failure, blood clotting disorders, and kidney damage that may not be immediately apparent.

Sources & References

[^1]: Hemmelgarn, C. & Gannon, K., "Heatstroke: Clinical Signs, Diagnosis, Treatment, and Prognosis," Compendium on Continuing Education for the Practicing Veterinarian, 2013. [^2]: Bruchim, Y., et al., "Heat stroke in dogs: A retrospective study of 54 cases," Veterinary Record, 2006.