Pig

Pig, Matt's Taxidermy pet is a character set to appear in several stories.

Total Wikia Elementary
Pig first appeared in Chapter 2 (The 1st grade Dance). Matt is seen dragging him across the way. When Nalyd sees Matt with the creature, he describes Matt as "A weirdo." Pig stands as Matt and Sunshine's companion and friend even though he IS dead. (IN THE WORKS)