How? ... There are many more channels. The breath - is not enough? If there psihobiopolya, the dog probably feel them both qualitatively and quantitatively determine the direction. But there is - and that's for sure - the alarm sign is quite natural, of which the dog owner knows best. "To transfer the mood is not required such gross actions, like, say, yawning. On the contrary, its characteristic feature - just in invisibility signals: they are very difficult to catch even an experienced observer. Mysterious apparatus for transmitting and receiving such signals are extremely old, he is much older than most of the human race and, of course, degenerated to the extent that both improves our language. "