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

Quiet. -2 to all athletics checks

Nervous. disadvantage on saves for exhaustion

Pack Tactics. The wolf has advantage on attack rolls against a creature if at least one of the wolf's allies is within 5 feet of the creature and the ally isn't incapacitated.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d6) piercing damage. If the target is a creature of size Tiny, it must succeed on a DC 8 Strength saving throw or be restrained.

Fetch.  Choose a item within 15ft that is not being worn or carried the dog uses its reaction to retrieve it 

Play Dead. The dog uses its reaction to play dead until the end of its next turn. This condition is indistinguishable  from death

Sic. Choose a target within 15ft of the dog. It uses its reaction to move and make a bite attack 

Lick. as a reaction Zasten licks her ally healing them for 1d4+2