Bergers are beautiful dogs! I really do think it comes down to the dog like you said. You can "force" them to do anything. Our "sister rescue" had a dog that was adopted by the Sherriff's Dept and is now actually an active K9 Unit, which was awesome, it just happened to work out. Since Shepherds are working dogs really any activity that you can provide them would be beneficial. We have seen dogs that go on to do search and rescue, therapy dogs, obstacle courses, etc.