Zombie Dog is a common pet that was obtainable by purchasing the 25th tier in the Halloween Event 2019. Though since the event has ended, it can now only be obtained through trading.
Zombie Dog is the Halloween reskin of the pet Dog, replacing the overall appearance with a zombie look, hence the name. It has zombie green fur with torn skin and scars throughout its body, along with its brain slightly exposed on the head. It also has one eye missing, replacing the iris with blank white.
Zombie Dog is currently the only zombie-related pet in the game.