"Heart of a Dog" is a novella written by Russian author Mikhail Bulgakov in 1925. The story follows a stray dog named Sharik who undergoes a transformation into a human after receiving a transplant from a deceased man. This change leads to a series of humorous and thought-provoking events that explore themes of identity and morality. The narrative critiques the social and political climate of Soviet Russia during the 1920s. Through Sharik's experiences as a human, the novella examines the complexities of human nature and the consequences of tampering with life. It remains a significant work in Russian literature, reflecting Bulgakov's unique style and perspective.