what kind of dog was cujo

Cujo was a Saint Bernard, a breed known for being gentle, playful, and protective of their families. In Stephen King's novel and its 1983 film adaptation, Cujo was originally a sweet-tempered family dog who became violent after contracting rabies. Saint Bernards are typically calm and affectionate, and the aggressive behavior portrayed by Cujo was due to the rabies infection, not the breed's natural temperament.