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Dogs live next to a man for thousands of years and for many centuries faithfully serve him, guarding the dwelling and herds, rescuing from the snowy debris in the mountains and helping the blind to move around the streets. And for many single people, dogs become close friends, often the only ones.

Dogs are amazing animals. The intellectual abilities of adult dogs allow them to understand more than 150 different commands, movements and even facial expressions of their owner. And the dog's scent helps her so subtly to feel the world and see it through the prism of smells, that a man should be recognized: in this, dogs are more perfect than us. In the nose, the dog has 300 million olfactory receptors, and the human is 50 times smaller. And part of the dog's brain, which analyzes odors, is 40 times larger than humans.

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