If a dog sweats through his tongue what are his armpits for?

Dog's Armpits

Dog's "sweat" through their exhale/breathing and through the pads on the bottom of their paws. It is not considered "sweating" anyway. Sweating in humans is to dampen the skin so that when the fluid evaporates it causes a cooling effect.

Their main way to cool down is through panting or breathing very rapidly which cool them internally. They do not have armpits, because they do not have arms. Those aren't pits; they're called flanks. They have 4 legs.

Dogs do have "sweat glands" on their paws. They do sweat heavily through their feet. That's why it is recommended that if you have a long-haired dog or a dog that requires frequent grooming to make sure you take it to a groomer on schedule to have its feet cleaned up.