Cujo (first appeared in Cujo)

Cujo was a massive St Bernard dog, owned by the Camber Family. Cujo was once a friendly and playful companion, but when he got rabies he went insane and was turned into a killer that attacked anybody who came near.

Cujo is mentioned in the following books:

Pet Sematary (Nov 1983)

“Rabies,” Crandall said. “Lot of rabies in Maine now. There was a big old St. Bernard went rabid downstate a couple of years ago and killed four people. That was a hell of a thing. Dog hadn’t had his shots. If those foolish people had seen that dog had had its shots, it never would have happened.”
- Part 1 / Chapter 6

The Dark Half (Oct 1989)

Alan reflects on the death of George Bannerman at the hands of Cujo.

George Bannerman was the local sheriff when those things occurred, but Big George, as he had been affectionately called, would not have to deal with Homer Gamache, because Big George was dead. He had survived the first bad thing, a series of rape—strangulations committed by one of his own officers, but two years later he had been killed by a rabid dog out on Town Road #3 — not just killed, either, but almost literally torn apart.
- Part 1 / Chapter 4 / Section 1

Skeleton Crew (Jun 1985)

The narrator mentions how the local folk of Castle Rock are still talking about how Joe Camber was killed by his own dog.

"But folks are still not done talking about Joe Camber, who got killed by his own dog."
- Mrs. Todd's Shortcut

The Dark Tower VII: The Dark Tower (Sep 2004)

The movie Cujo is brought up by character Bryan Smith, who mentions the title to the Stephen King character as they wait for an ambulance to arrive. Their conversation may also suggest a minor connection to Jake, who died in the book (The Gunslinger) but also somehow lived.

“You know who I am.” “God yeah!” Bryan Smith said, and chuckled. He took a bite of the candy bar and talked through it. “Reckonized you right away. I seen all your movies. My favorite was the one about the Saint Bernard. What was that dog’s name?” “Cujo,” King said. This was a word Roland knew, one Susan Delgado had sometimes used when they were alone together. In Mejis, cujo meant “sweet one.” “Yeah! That was great! Scary as hell! I’m glad that little boy lived!” “In the book he died.” Then King closed his eyes and lay back, waiting. Smith took another bite, a humongous one this time. “I liked the show they made about the clown, too! Very cool!”
- Part 3 / Chapter II / Section 7