In a small town in the United States, the life of the Trenton family changes drastically when their car breaks down on a hot summer day. The mother, Wendy, and her young son, Tad, find themselves trapped in a vehicle in the middle of nowhere, facing an unexpected danger. What seemed to be just a day of fun turns into a nightmare when they encounter a large dog, a creature that used to be friendly but has now been transformed into a deadly threat.
The animal, a St. Bernard named Cujo, has been infected with rabies, and its behavior becomes increasingly erratic and aggressive. With no way to escape, Wendy and Tad must find a way to survive as they confront the growing terror posed by the rabid dog. With the relentless heat outside and the tension rising inside the car, their situation becomes a desperate fight for survival. As time passes and the hours stretch into eternity, the mother-son bond is tested, revealing their deepest fears and desires for survival.
This chilling story not only explores the physical terror represented by Cujo but also the inner demons that each character faces in the face of adversity. With unexpected twists and a climax that takes your breath away, the film becomes a harrowing study of struggle and resilience in the most challenging circumstances.