I agree with most of your two posts. And welcome to the board.Haha sorry I almost forgot about the OP's question. Sorry when I get side tracked it takes over. I would also have to agree with the working bloodlines, and mix. Czech is a good guess, but it seems as if the lines are too straight. It's as if the dog was bred in a rectangular box. Given the angles of the back and head shape the pup would seem to be a mix. Without anymore information it would be hard to speculate, but I must admit I like his appearance. He won't show, but that's fine because show GSDs are bastards of their breed.
Not sure what you mean about show GSDs being bastards of their breed. I mean, they can trace their ancestry. Are you opposed to German showline dogs, American showlines, British or Austrailian or Canadian Showlines, American Specialty showlines, or just all showlines in general.
Just a word to the wise though, we have members with showline dogs, and they feel their dogs are the best dogs just like working line people feel their dogs are the best dogs. You do not have to agree with them.
Just trying to coexist with the owners of the various types of dogs, because many of the issues that we discuss are the same regardless to what lines the dogs are.