I've heard stories of patriotic Americans with German surnames being harassed during World War I, but never of poor little dachshunds being persecuted. The solution would have been simple--call them badger dogs, since that's what Dachshund means in German.
"I've...never [heard] of poor little dachshunds being persecuted."
My mom told me there used to be a cat in a deli out where she lived in Queens that had markings that made him look like Hitler, and people were very mean and kicked the cat. So the owner had to make the cat stay in the basement.
I don't know if this is really true, but it is a fact that my mom was 1/2 German, and they had a German last name, but a rather unusual one, so you might not realize it was German. I don't think her dad ever had any trouble, or course he had come here as a wee child, so he had no accent or anything. He was in the Navy in WWI.