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Dogs are generally much better at conserving heat than at cooling themselves. In sled dogs, who can survive outdoors even in bitterly cold temperatures, the fur acts as an insulating “blanket” that retains the heat generated by the dog’s high metabolism. However, in hot or humid weather, most dogs have difficulty. Dogs cannot sweat, which is an effective form of evaporative cooling. Instead, dogs lose heat primarily by panting. These rapid breaths (10 times faster than normal) are an attempt to lose heat through evaporation by moving hot, moisture-filled air in and out. During the short, shallow breaths in panting, little air can be exchanged in the lungs. In fact, dogs must stop panting periodically to take a good respiratory breath. Drinking water also helps dogs cool down, and the canine hair coat helps insulate from the sun.

Because the cooling system of dogs is relatively poor, certain summer situations can be dangerous and even life threatening. Sadly, many dogs die of heat stroke every year (see What to Do at the Scene and How to Transport). The most common problem is associated with being shut in a parked car. Even with the windows rolled down, the inside of a parked car can quickly reach 150°F (66°C) or more in the summer, which can cause heat stroke and death in a matter of minutes. Other dangerous situations involve being penned or tied out in the sun (without access to shade) or being locked in a poorly ventilated travel crate.