A story is the "Doggy heart" - one of the known and memorizable works in work of Mikhail Булгакова. With inimitable sarcasm and humour of Булгаков described the unprecedented risky experiment of professor Преображенского on converting of dog into a man, creating a magnificent parody on the paradoxical situation of Soviet Russia of 30th. Cruel experience shows on the leadingout of new "breed" of people, that it is impossible with impunity to experiment with nature and change Divine Trade in order to please political aims. The offspring of similar experiments are able to destroy the creators.