Since the dog&#39;s ancestors began to evolve around 130,000 years ago, something changed among the Canidae. In fact, in spite it was already present in nature the coexistence of different species, dog and mankind have extolled the highest levels of interspecific cooperation, coming to real cultural exghange: the dog learns from the man and the man learns from the dog. And this is the only way that the human being has to be able to steal secrets from his partner that make it a particular animal, an ideal companion.<br />The book tell the origin, evolution, psychology and all the mechanism which are the basis of this extraordinary combination unique in Nature.