Zwei is the pet dog of Ruby Rose and Yang Xiao Long. He first appeared in the episode "Field Trip", when he was mailed to Beacon Academy from Patch by Taiyang Xiao Long along with a pile of canned dog food and a can opener. Taiyang sent Zwei to his daughters to take care of him temporarily due to him leaving Patch for undisclosed reasons.
Powers and Stats
Classification: Pembroke Welsh Corgi
Powers and Abilities: Superhuman Physical Characteristics, Able to manipulate and use his Aura (Ki/Chi) defensively (Enhances his natural durability) and offensively (Enhances his striking power and sharpens his senses), Enhanced Senses of hearing and smell, Resistance to fire
Attack Potency: Unknown (Was able to kill a Beowolf with a single headbutt)
Speed: At least Supersonic (Killed a Beowolf before it could react), likely considerably higher (Somewhat comparable to the members of Team RWBY, if considerably lower)
Lifting Strength: Unknown
Striking Strength: Unknown
Durability: At least Multi-City Block level (Durable enough to survive Professor Oobleck using him as a projectile to oneshot an Atlesian Paladin)
Range: Melee range
Standard Equipment: None
Intelligence: Above average for a dog
Weaknesses: Rather clumsy, inexperienced, lacks the ability to use his Semblance and Aura at will, Continual use of his Aura will cause it to decay to the point where he can be left weakened or even incapacitated
Zwei is a very intelligent dog, implied by Yang to be capable of using mechanical tools such as can openers, and responding correctly to Ruby's questions when needed. As a dog, he has the requisite heightened senses of smell and hearing, which allowed him to find the White Fang soldiers in "Mountain Glenn". Likely due to his Aura, Zwei has been shown to perform feats no normal dog can do. He was first introduced compressing himself into a tube alongside dozens of cans of dog food and a can opener for an undisclosed amount of time without any ill effects on his body. Later, in "No Brakes", he is shown to be fireproof and very durable, as seen when he destroys an Atlesian Paladin-290 by being lit on fire and launched by Oobleck. This is demonstrated once more in "Breach", where he survives the train explosion by taking shelter inside a Paladin, then proceeds to headbutt and defeat a nearby Beowolf.