The author writes captivating stories about how people interact with their pets—cats and dogs. He sees them as the only representatives of the animal world who have become true friends of humans. A dog is loyal and unquestionably obedient to a person, while a cat is tricky and capricious. The author wonders what determines the behavior of these animals and how the concept of "instinct" can be explained. In his book, he offers answers to these and other questions that will interest readers of all ages and from different countries.