Well, 'Cujo' is a novel that mainly revolves around a dog named Cujo. A once gentle family pet gets rabies and becomes extremely dangerous. It traps a mother and her son in a car. Stephen King uses this situation to build a lot of tension and horror. He shows how isolation and the presence of a menacing threat can drive people to the edge.
There's Cujo, the rabid dog of course. And then there's Donna Trenton, the mother who gets trapped in the car with her son Tad. Vic Trenton, Donna's husband, is also an important character.
Stephen King is often regarded as the king of fiction. His vast body of work, spanning various genres and captivating millions of readers, justifies this title. His ability to create suspense and memorable characters is remarkable.
I'm not entirely sure if there's a specific work titled exactly like that. Stephen King is known for his horror and supernatural works mainly, but he has also dabbled in other genres. It could be a relatively unknown or a misnamed piece, or perhaps it's a very niche story within his extensive bibliography.
Cujo definitely isn't science fiction. It belongs to the horror genre, where the main element is the fear and danger posed by the rabid dog. There are no typical science fiction elements like advanced technology or alternate universes in it.