Cujo, an easygoing St. Bernard, playfully chases a rabbit until it accidentally gets its head in a bat cave, where a rabid bat bites its nose. Meanwhile, the Trenton family â advertiser Vic, housewife Donna, and their sensitive young son Tad â take their car to the rural home of abusive mechanic Joe Camber for some repairs, where they meet Cujo, who is the Camber family's pet. Donna notices Cujo's bite but thinks little of it. Later, Vic and Donna's marriage is tested when Vic learns that his wife is having an affair with her ex-boyfriend from high school, Steve Kemp, while Vic's advertising for a cereal commercial is failing. After Joe's wife and their son leave the house for a week, Cujo's bite drives him mad, and he kills Joe and a neighbor.
Vic goes out of town on a business trip as Donna and Tad return to the Cambers' house for more car repairs. Cujo attacks them, and they take shelter in their Ford Pinto. Donna tries to drive home, but the car's alternator dies and the two are trapped inside. The hot sun makes conditions nearly unbearable and Donna realizes that she must do something before they both die from heatstroke or dehydration. Attempts at escape, however, are foiled by Cujo's repeated attacks. Vic returns home to rekindle his marriage, only to find Donna and Tad missing and his house vandalized by Kemp. He suspects the possessive Kemp of kidnapping, but then realizes his wife and son might be at the Camber's residence.
The local Sheriff arrives at the house and has a brief standoff, before Cujo kills him. Meanwhile, Donna takes advantage of a momentary distraction and hits Cujo with a baseball bat until it breaks, leaving only a jagged handle. Cujo jumps at her and is impaled in the stomach by the broken bat. Donna then retrieves a dehydrated and overheated Tad, along with the sheriff's revolver. As Donna revives Tad in the house, a recovered Cujo breaks through the kitchen window and tries to kill them. However, Donna fatally shoots him just as Vic arrives, and is reunited with his family.
What was Cujo chasing?
a rabbit