Why the dogs pant?

The reason why these faithful animals pant, is that they do not have sweat glands.

Warm-blooded animals (including humans), has these glands in order to lose body heat when it rises. In the moment the body begins to heat up, the sweat glands cover certain areas of the skin with a thin coat of liquid (mostly water), which while it evaporates, cools the skin (the water in order to evaporate, requires a certain amount of energy, in this case the heat of body, that is transfered through the skin), then, the skin extracting heat in this process.

Therefore, because the dogs not have sweat glands, have another mechanism to cool their bodies, they are cooled, carrying a large amount of blood into the tongue, Then when the dog gasps, passed cold air over the surface of its tongue, the heat exchange that takes place, causes the blood passing through the tongue to cool, and it, when returns to the animal's body in its normal circulation, it cools. Because the tongue is also wet, when the moisture evaporates, remove even more heat.

The wisdom of nature gives each species the mechanisms to overcome obstacles every day.