To make reading easier, this page is split up in two sections:
- Main pets - These are the Ghoulfriends' pets (the main ones), so they usually appear frequently in episodes and products. They also have their own episodes, recounting their adventures.
- Primary pets - The pets of Monster High that are marketed by the franchise, which are not main, but appear variably in products. Typically, they have a trademark and are given a role in their owners' diaries.
- Secondary pets - The pets of Monster High that are essentially fiction-only and rarely feature in more than one medium.
All characters within a section are listed alphabetically.