Zwei

Zwei is the pet dog of Ruby Rose and Yang Xiao Long. He first appeared in the episode Field Trip, which was released on September 25th, 2014.

Appearance
The dog appears to be a Siberian Husky.

Personality
Zwei exhibits a very cheerful and playful personality, as seen when he licked Ruby and barked happily after being cuddled by Weiss Schnee.

Trivia

 * His name is likely a reference to the Cowboy Bebop character Ein, who is also a dog. Ein is German for 'one', while Zwei is German for 'two'.