I choose all my puppys by if i stick my hand in there and one is ruff and will bite on my hand i pick the one tht bites me. All mine have turned out good but might just be Cause there out of good stock.
Lol that's how we picked our Lab. My wife walked to the pen stuck her finger in and he came thru all the pups and bit her. She looked at me and said i want him. he is now 12 and has been a good dog.
I usually pick the one that my gut picks. Just the one that feels right.
Shotgun
Arkansas