Is there a book called demon dog?

There isn't one single, definitive book titled "Demon Dog." However, there are a number of books that feature demon dogs or similar creatures, making it possible you're thinking of one of them!

To help me narrow it down, could you tell me more about what you remember about the book? For instance:

* What is the genre? (Fantasy, horror, mystery, etc.)

* What is the plot like? (A boy befriends a demon dog, a dog is possessed by a demon, etc.)

* When did you read it? (Roughly, like childhood, high school, etc.)

* Any other details you remember? (Characters, setting, cover art, etc.)

The more details you can provide, the better chance I have of finding the book you're looking for!