The Dogs are always open mouthed with their tongues protruding out of their mouth down-words,the reason is that they sweat only by their tongue. In other words the sweating of dogs are excreted only through their tongue and not by their body skin as in the case of other sweating animals.Like wise the sweating of crocodiles are excreted through their eyes only and it is famously called as CROCODILE TEARS!
