The author has confirmed that, among other Easter eggs, the killer dog Cujo will be making an appearance in The Dark Tower movie.
Cujo may not have shown up in the first trailer for The Dark Tower, but several other major Easter eggs did.
While talking about some Easter eggs in the movie, and it looks like there will be a lot, Stephen King revealed his personal favorite, Cujo, which is one that wasn’t in the trailer.
I think people are going to be very pleased with both that and The Dark Tower.