Heart of a Dog is a novel written by Mikhail Bulgakov that tells the story of a stray dog named Sharik who is transformed into a human by a mad scientist. The scientist, Professor Preobrazhensky, performs the experiment in order to prove his theory that the human brain can be altered by transplanting organs from animals.
As Sharik becomes more human-like, he begins to exhibit the worst traits of humanity, including greed, violence, and cruelty. The novel explores themes of identity, morality, and the nature of humanity.
Heart of a Dog is a satirical and allegorical work that criticizes the Soviet government and society of the time. It is considered one of Bulgakov's most important works and has been adapted into various films and plays.