
This is another view - I'd not want to import a puppy at 15 weeks, if it includes a long haul flight especially. Yes I exported a puppy to Switzerland from the UK. I flew out with him (he was still in cargo) when he was 4 months. I'd not have let him go at a younger age. He was a happy outgoing pup too.
My foundation bitch came out to us from the UK to Canada, at 5 months and a second puppy, a male, came to us out there, at 7 months. Mind you, with my main breed, buying at a younger age would be a lottery as the breed develops differently to other breeds, eg terriers where what you see as a young puppy, is usually pretty much what you get. Bassets can change drastically through the first year.
I wholeheartedly agree that the importing of young puppies in 'batches' needs to be stopped. Importing young stock for their bloodlines, by legitimate breeders is another matter.