Stop using endangered species for your Nazi super science!
1.The Fuso Wolf is still around in Strike Witches, if rare; ergo the animal spirit of the creature would also exist to become a witches familiar by forming a compact. 2.Her familiar features are that of her spirit animal, so that's what her features are. 3.She's from Fuso, which is the Strike Witches iteration of Japan. She's not from Karsland or the Strike Witches version of Germany. 4. Nazi's don't exist in strike witches as the climate, nations and events that occur in strike witches do not allow Nazi's to ever become a thing in their verse. 5.Despite the 1940's aesthetics and technology: Karlsland is culturally WW1 German empire, not WW2 Nazi Germany. Both are not the same thing and so, see point number 4 in regard to why Nazi's don't exist in strike witches.