Cujo by Stephen King

Cujo is a psychological horror novel by Stephen King. The novel won the British Fantasy Award in 1982, and was made into a film of the same name in 1983. The story focuses on the Trenton family: Vic, an advert designer, his adulterous wife Donna, and their four-year-old son Tad. The latter two are terrorized by the eponymous Cujo, a rabid St. Bernard.