yes, do the ball test. And the chicken test, take a young pullet and show it to the pups. If you see one smell it, lick her gently and then walk away, grab him and run away with it LOL. Also, if you can meet the litter, pick the one seems more reserved and laid back. The ones that don't play that much but are watching from a distance (no shyness or submissive) The aloofness is a good sign of independence which is crucial, especially if he will be raised as an only dog in the flock. The breeder can usually help you since he has seen them interact and should have a pretty good idea of their personalities so far.