Here's what www.netflix.com says:
Based on horrormeister Stephen King's best-selling novel, Cujo chronicles a tale of man's best friend turned satanic killer. Slobbery St. Bernard Cujo is much loved by owners Donna Trenton (Dee Wallace) and her son, Tad (Danny Pintauro), but when a rabid bat bites Cujo, he morphs from happy pup into crazed canine. In the nail-biting climax, Donna and Tad barricade themselves in their car, with 200-pound Cujo skulking nearby. …
Great, great horror movie! First off, who wouldn't be afraid of a giant dog, foaming at the mouth & trying to attack you?? Immediate horror!! On top of all that, the woman is trapped with her small child, who is panicky. Every mother knows, every good mother would so go one on one with that dog for their child's health or life. Really enjoyed this & the ending totally made me not only jump, but scream!