Do dogs sweat from their tongues?

Do dogs sweat from their tongues?

Most people believe that the dog's tongue contains sweat glands, but this is not true.

Most of the dog's sweat glands are located around its foot pads. That is why, when a dog is overheated, you will sometimes see a trail of wet footprints that he has left behind as he walked across the floor.

But if this is proved, why is some people still thinking the other way round? That’s because the dog's tongue and mouth are associated with many salivary glands that produce different forms of saliva. For this reason we think that they just run with their mouth opened for not swallowing the sweat, but it’s for panting (a way cooling that moves air across saliva-moistened surfaces of the mouth cavity) which helps them to eliminate some heat.

Dogs also have other methods to keep cool, such as vasodilation which consists on dissipating heat by dilating (expanding) blood vessels in the face and ears. This helps to keep the dogs’ blood cooler by causing it to flow closer to the surface of the skin allowing it to cool before returning back to the heart. This mechanism works better if the overheating is due to exercise, rather than a high outside temperature. 

On a hot day, especially if the dog is very active, he can overheat (hyperthermia). This can eventually lead to heat stroke. A dog that is overheated will seem sluggish and perhaps confused. If you look at his gums and tongue they may appear bright red, and he will probably be panting very hard. If left unattended to, the dog may collapse, vomit, have a seizure, or even go into a coma.