It's a true story. I just researched it. A Berlin paper showed a picture of the dog (a black shepherd mixture) and his dog-house with the Name "Adolf" inscribed on it by the owner, a Berliner. The owner actually went to jail and the dog, renamed "Adi", to an animal shelter. That's our kraut's silly way to atone for the Holocaust.
Iranian president awards nuclear deal team medals of honor (AP)
from the article: Report: German man jailed for teaching his dog to perform Nazi salute