nchank,
i have picked up pups on day 49 they turned out
ok,
i currently have a blf i had to pick up on day 42. she seems to be turning out
ok (hillman dvd thru session 13),
i have an 18 month old clf i picked up at 91 days and he's doing
ok (a friend purchased this dog, put in his back yard then got sick and passed away, took the pup to help the widow).
let's face it, maybe i am just an
ok trainer.

lol
i like seven weeks because they are really cute at that age and a little more secure than at six weeks. i have never seen evidence that any mysteriously negative or positive impacts occur develpmentally that can only be attributed to the day you picked up your pup.
we give excuses about performance at a trial or test because 1. the sun was better for those that ran early. 2. the judges suck 3. the wind changed on me etc...etc......... but did you ever hear a pro say "we were right there in the tenth series...i just can't explain it.... we had it won then, bam the wheels ran off. i told my client (the ceo of dean slitter) not to pick that puppy up in his lear jet on the 46th day!"?
IMHO it is all about the ride home with us and what we do, every day after that. the number of the day that ride takes place is just a good thread topic.
john mc