"Cujo" is a horror novel by Stephen King that tells the story of a massive, rabid dog named Cujo. Once a friendly Saint Bernard, Cujo becomes a terrifying threat after being bitten by a rabid bat. The story unfolds in a small town, where the dog terrorizes the community, leading to a tense and gripping narrative. The main characters, Vic Trenton and his son Danny, find themselves trapped in their car when Cujo attacks. As they struggle to survive, the novel explores themes of fear, isolation, and the unpredictability of life. "Cujo" is a chilling tale that keeps readers on the edge of their seats.