Keen Hearing and Smell. The Zombie Blink Wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Undead Nature. A Zombie blink Wolf doesn’t require air, food, drink, or sleep.

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the Zombie Blink Wolf drops to 1 hit point instead.

Pack Tactics. The Zombie Blink Wolf has advantage on attack roles against a creature if at least one of the ZBW's allies is within 5 feet of the creature and isn't incapacitated. 

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 4 (1d12 + 5) piercing damage.

Howl of the Undead. As an action you let out an almighty howl, any ally undead 30ft within range gain +2 to their next attack roll.

Teleport (Recharge 4–6). The Zombie Blink Wolf magically teleports, along with any equipment it is wearing or carrying, up to 40 feet to an unoccupied space it can see. Before or after teleporting, the dog can make one bite attack.