Sharik is a fictional dog character from the novella "Heart of a Dog" written by Mikhail Bulgakov. In the story, Sharik is a stray dog living in Moscow who undergoes a transformation into a human after an experiment by a scientist named Professor Preobrazhensky. This transformation raises questions about identity and the nature of humanity. As a dog, Sharik embodies loyalty and instinct, but his new human form leads to chaotic and humorous situations. The story explores themes of social class and morality, reflecting the complexities of life in early 20th-century Russia.