Professor Preobrazhensky is a fictional character from the novel "Heart of a Dog" by Mikhail Bulgakov. He is a prominent surgeon in Moscow who conducts an experiment to transform a stray dog into a human. This transformation raises questions about identity and morality. The character embodies themes of science and ethics, reflecting the complexities of human nature. Through his actions, Professor Preobrazhensky critiques the societal changes occurring in Russia during the early 20th century, particularly the impact of the Bolshevik Revolution. His story serves as a satirical exploration of the consequences of playing God.