Pet Cemetery

The  is a limited-time building that was first released in the Treehouse of Horror XXIII Event. It spawned pet zombies that needed to be tapped to prevent Springfield residents to be turned into zombies. They looked like Santa's Little Helper and Snowball II, except they were blue-green. It was re-released as premium item for the Treehouse of Horror XXIV Event, and has ever since been released in all Treehouse of Horror events.

During the Treehouse of Horror XXV Event it was brought back bundled with either the Clawing Zombie, the Snarling Zombie, or both depending if any of those characters was previously unlocked. It could have been purchased alone only if both characters were owned.

It returned on January 23, 2018 during the Bart Royale 2018 Event as a possible prize in the Doomsday Mystery Box.

It was re-released again on October 11, 2018 for the Treehouse of Horror XXIX Event, as part of the Pet Cemetery + Zombies bundle.

Trivia

 * So far, the Bart Royale 2018 Event has been the only non Treehouse of Horror event to re- release the Pet Cemetery.