We have a 10 week old who is also at your pups level. The thing you have to constantly remember is that GSDs are not like normal dogs. They tend to be very sensitive to discipline, which could make them fearful/insecure. If we didn't see him do it (were only human and he wanders out of our sight sometimes), one of us plays with him in the other room while the other cleans it with an enzyme cleaner. We never let him see us clean it because we don't want to draw any attention to it. Now if we see him squatting, we do a firm but not "mean" No and pick him up mid-stream and gently take him outside and say "go potty". We have noticed if we get frustrated an raise our voice, he really gets sad and just kind of shuts down for a few minutes. Every time we take him outside and he goes, we act like he just won the Nobel prize.
This is just our method. It really seems to be working.
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