The dog - a loyal friend and assistant man since ancient times. She first came to him from the depths of the forest, and took his patronage. It was a very, very long time. Primitive man constantly fighting for his life. He listened to every sound, the sound of a stranger: not sneaking up to an enemy? A dog hears what the person can not hear, smell, are not available to the human sense of smell. Especially at night it is very sensitive: in fact last dog was a nocturnal predator. It took many many years before the predator forgot savage habits and become a true friend of man.
