One of the great essential classics of Stephen King, great master of horror literature.
Throughout his life Cujo was a good dog, a large, peaceful, playful and child-loving Saint Bernard. It really was a good and happy dog. Happy until something happened to him, and Cujo's dog brain was covered in one of those dark ones that feed on blood.
Now, he has become a killer dog; doubly cruel in that people do not know his mutation and still see him in his former goodness. Herald of a small apocalypse, Cujo will unleash a hurricane of panic and death on a model town.