Its hard if you don't breed the litter yourself and go in cold, usually a litter of 9-10 pups 1or 2 are really the only ones worth keeping.If a friend bred the litter its a good chance he'll steer you in the right direction. If you do go in cold what i do is temperament test a shy dog is a dead dog here, then confirmation for the job it will be doing, coat next and then color. I use to never take a whit dog as it got me in trouble but where I live now it doesn't matter.