"The 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 an experimental surgery by a scientist named Professor Preobrazhensky. The narrative explores themes of identity, morality, and the nature of humanity. As Sharik adjusts to his new life as Poligraf Poligrafovich Sharikov, he grapples with the complexities of human society. The novella critiques the social and political climate of post-revolutionary Russia, highlighting the absurdities and challenges of modern life through a blend of satire and fantasy.