Humans are a bit more adept at cooling off than dogs, though, and not just because people do not have a thick layer of fur to contend with. You can sweat, which evaporates off your skin and helps you cool down, and your blood vessels expand to allow increased blood flow.
Dogs, on the other hand, cannot sweat. According to the American Kennel Club, their methods of cooling off (thermoregulation) are primarily panting and expanding blood vessels. These are not quite as effective, leaving your companion more vulnerable to the summer temperatures.
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