Continuity mistake: When the phone begins to ring, Cujo goes mad and starts bashing the side of the car in. He then shatters the passenger window of the car. In the very next shot it can be seen intact again and then alternates from shattered to intact from thereon. (01:01:15)
Cujo (1983)
Plot summary
Directed by: Lewis Teague
Starring: Dee Wallace, Christopher Stone, Danny Pintauro, Daniel Hugh Kelly
A friendly St. Bernard gets bitten by a rabid bat and slowly becomes a family's worst nightmare.
More mistakes in Cujo
Donna Trenton: Damn this car.
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Answer: Not really. Rabies has a wide range of behavioural symptoms, and it's rare for a rabid dog to display what's called "furious rabies," whereby they become more aggressive. And even then, they wouldn't become single-mindedly determined to terrorise two people in a car. It's much more common for a rabid dog to get slower/lethargic as paralysis sets in, eventually leading to coma and death. You can find more info here: https://vcahospitals.com/know-your-pet/rabies-in-dogs.