Coffin Zoge (ヒツギイヌ Hitsugiinu, Sheepdog) is an enemy that only appears in the Stories of Legend.
Coffin Zoge is a Zombie counterpart of Wall Doge. It can't burrow, but can revive an infinite amount of times, making it an annoying wall, especially in its first appearance paired with Dark Emperor Nyandam and Tackey. Zombie Killers are recommended to prevent it from remaining a permanent wall.
When facing a horde of these enemies, it's a good idea to use area attackers so they all die at once. If you kill them individually, it will be difficult to push past them because the previous Coffin Zoge will revive before you can kill the next one.
You can override this enemy's "infinite revives" ability by killing it with a unit that has Zombie Killer.