Does your GSD absolutely love being vacuumed?
My old partner, that we lost several years ago, would get manic once the vacuum was started and would follow us around barking and dancing until he got his "once over". It made the GSD hair syndrome so much easier to deal with. An attachment, that I still have, with silicone dimples on the face, turned out to be a much loved grooming tool. We will be introducing our new puppy (this spring) to the Hoover Massage !!