Zombie Dog is one of the three skins released under the Rise of the Dead part of the Zombie Party offer. It was available for individual purchase in early August 2017.
Zombie Dog could be purchased in the Skins Shop under the ‘Zombies’ tab for 2900 coins. However, this skin may not be available for purchase in the future.
Details of this offer may vary depending on location and platform.
Gallery
Zombie Dog - Original Image