A friendly St. Bernard named "Cujo" contracts rabies and conducts a reign of terror on a small American town.
Donna Trenton is a frustrated suburban housewife whose life is a turmoil after her husband learn about her having an affair. Brett Camber is a young boy whose only companion is a Saint-Bernard named "Cujo", who in turn is bitten by a rabid bat. Whilst Vic, Donna's husband is away on business, and thinking over his marital troubles, Donna and her 5-year-old son Tad take her Pinto to Brett Camber' dad's car shop... the car fails, and "Cujo" is very, very sick...

sturdy and lovely St. Bernard dog was bitten by the bat , fierce and big hair to become wins life rabies . A mother and son in a deserted farm has been its attack , in the case without external support , the mother and barricaded inside the car to wait for rescue . ...