If you're picking out a pup from someone else's litter... just close your eyes and grab one.
They change completely from week to week and month to month. I don't agree with culling that early for conformation either. The last two sets of pups I raised has proven that to me. The ones that were ill built as pups turned out to best built in the bunch.
Pups change so much that first year it's hard to cull one unless there's an obvious physical or mental problem.
X2.. The only thing I will cull one for that young is if it's mostly white with a white head..
