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Nightmare Fuel: Cujo
Trapped in a car, with a rabid St. Bernard lurking around, and meanwhile, your four-year old son is going into seizures.
The three most particularly terrifying scenes post-rabies infection, are when the titular dog mauls his owner and the neighbor, when he takes a bite out of the mom while she and her son are trapped in the car, and the penultimate scene when, having gotten back up from a No-Holds-Barred Beatdown inflicted by the mom with a baseball bat moments earlier, he shows up unexpectedly just before he dies via gunshot inflicted to the head. Yep, Paranoia Fuel aplenty.