Cujo

By Stephen King
 
Cujo used to be a big friendly dog, lovable and loyal to his trinity (THE MAN, THE WOMAN, and THE BOY) and everyone around him, and always did his best to not be a BAD DOG. But that all ends on the day this nearly two-hundred-pound Saint Bernard makes the mistake of chasing a rabbit into a hidden underground cave, setting off a tragic chain of events.
 
Now Cujo is no longer himself as he is slowly overcome by a growing sickness, one that consumes his mind even as his once affable thoughts turn uncontrollably and inexorably to hatred and murder. Cujo is about to become the center of a horrifying vortex that will inescapably draw in everyone around him—a relentless reign of terror, fury, and madness from which no one in Castle Rock will truly be safe…