I don't like the shy gene and breed away from it regardless of box quality. Imo it is an insecurity. I watch and watch and watch and watch puppies, and I have really developed a knack for picking. They three puppy traits I look for in order of importance are, "happy go lucky attitude" that is the one that runs up to the cage each time with tail wagging, barking and crying for attention. 2. Body structure, 3. Dominance over littermates. This is just my opinion. The happy tail wagging puppy is most confident. With a good structure and dominant attitude, that's how I pick them. The shy one that kicks ass, he is kicking ass out of fear. Big difference. That's my two cents. Oh, and I socialize with humans as much as I can. More socialized makes a smarter dog. A smarter dog finds a way to win.