This is actually a crossover between Family Dog, Frankenweenie, and Nightmare Before Christmas, but I was only able to add two categories. In this story, Zero travels through the Halloween door to our world to find the original family he might've had before he died and met Jack and Sally.
Crossover - Family Dog & Nightmare Before Christmas - Rated: K - English - Supernatural/Family - Chapters: 1 - Words: 4,993 - Reviews: 1 - Favs: 1 - Follows: 1 - Published: 3/11/2019 - Jack S., Sally, Zero - Complete