Cujo IMDB
While Donna and Vic Trenton struggle to save their rocky marriage, their son Tad befriends the loveable 200-lb St. Bernard who belongs to their mechanic. But what they don't realise is that a bat bite has transformed Cujo from a docile pup to a vicious killer.
Directed by: Lewis Teague
Screenplay by: Don Carlos Dunaway, Lauren Currier
Starring: Dee Wallace, Danny Pintauro, Daniel Hugh-Kelly, Christopher Stone, Ed Lauter