* A specific book or movie: There might be a book or film with that title. If so, what is the name of the book or movie?
* A general concept: Are you interested in the general concept of a dog in Pompeii? This could refer to the story of a dog surviving the eruption, or perhaps a fictional story about a dog in Pompeii.
Please give me more information so I can give you a specific answer about the exposition of "Dog Pompeii."