Greta is a quaternary antagonist Wolfenstein: The Old Blood, was a Kampfhund that belonged to Rudi Jäger. Rudi was very attached to the dog, and spoiled her a lot, also calling her the “happiest dog in Germany”. After B.J. escapes from the electric chair Rudi trapped him in, he brutally kills Greta, sending Rudi into an immense rage and sadness, shown by his battle later in the game.