How to select a healthy german shepherd puppy?

There is a puppy aptitude test developed by the Volhards. I give it to all of my dogs and puppies, to match them with their owners. When I choose a puppy from another breeder, I use it. I tend to like the puppy that approaches me curiously, and starts interacting with me right away. There's more to it than this, but it's easier for you to follow the link below :)