The dog has accompanied man the longest of all animals. Over the last several hundred thousand years, the dog has deserved to hold a special place in the life of man. It has become a rescuer, a guide, an assistant, a therapist, a defender and a friend. The relations of people and dogs are unlike the relations between man and any other domesticated animal. What has made the dog such a close friend for man? Using modern research methods, scientists have been looking for answers to this question. What was the domestication process, how long did it take and where did it start? Today we already know that the dog domestication process was started many times and independently in different parts of the world. The cradle of dog species turned out to be in Europe, not Asia, as was suggested before. The aim of this study was to review the latest research on the course of the dog's domestication process, as well as an indication of the characteristics of this species, which influenced the achievement of success in his domestication. It presents the results of archaeological, morphological and genetic studies. Different theories, as well as the behavioural aspect of this process, were described.