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

Unwavering Loyalty. Yumi will always follow the commands of an NPC/Player that they have a positive relationship with (i.e. the dog's owner).

Force Prone . if commanded Yumi will run up to a target and jump on them forcing them to do a DC 13 strength saving throw to see if they can get her off  if failed Yumi has tackled them to the floor and has sat on them forcing them prone until the end of Yumi's next turn

Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) piercing damage.

Bark. Yumi uses a bonus action to have a creature within 15ft of it make a DC 11 Wisdom saving throw or become frightened until the end of Yumi's next turn. The targeted creature(s) must be capable of hearing in order for this condition to take effect. Creatures affected by the Unwavering Loyalty trait automatically succeed this saving throw.