Why do humans sweat and dogs pant?

Humans sweat to release hot "water" from their bodies to evaporate, in order to cool their body's temp. Dogs pant because they can not sweat. Panting brings in more oxygen for the animal's blood stream which cools their temp down too. read more

Dogs do sweat, but only on the hairless pads of their feet. However, their major method of temperature control is through panting, usually with their tongues dangling outside of their mouths. This allows transfer of heat from their core body/chest area straight out of their mouths through their breath. read more