I've been looking at the photos the breeder sent me of the puppies. They're 5 weeks old in the photos, but they're 6 weeks old as of yesterday, now. I'm getting a male, there's 3 males, 2 I can pick from (someone else has first pick) I'm trying to figure out if I can tell which ones are the males and which ones are the females, just by their size in this photo.