Zero is a dog-like ghost with a body made of white sheet, basset hound-like ears, black eye sockets, long and thin snout, upper jaw curls at the tip, very small glowing pumpkin nose, faded brown collar.
The Nightmare before Christmas Edit
*Zero is based on Rudolph the Red-Nosed Reindeer and Max, the Grinch's dog
*Zero is the only pet and animal in the movie that is a ghost
*Zero doesn't speak, but barks and acts like a real dog