Their dedication has long been proverbial. On land and on the water, in war and in peace time they are ready to come to us for help, sometimes at the cost of his life.
Just a few thousand years back to the person that managed to tame feral animal. And from that time dog lives next door to us, selflessly giving love to the owners …
Why the same species is characterized by a variety of different features like? And why they are willing to risk their lives to save ours?