
If socialisation is carried out by the breeder early then even if the pup is isolated later, and the basic temperament is sound the pup will be fine as long as the new owner continues with socialisation.
Two examples from personal expereince.
In Nov 98 I bred a litter one of whom was destined to be exp[orted to a fellow breeder in Australia. Now the export regulations required vaccination and blood tests at certain intervals, which mant pup would not go until 14 1/2 weeks of age. It would then undergo a Months Quarantine in Australia, so no normal life in new home until 19 weeks.
Now knowing this I started carrying this puppy everywhere I went (more so than it's littermates who would get the normal amount of socialisation, taking out to see traffic etc). By the time she was ready to go (this was before the new early vaccinations, so no on ground walking until 13 weeks) I was taking her about in a holdall, with ther head poking out as she was so heavy.
She di her month solitary in OZ, and then had to face another flight (they have government run Quaratine Stations, only two of them), this was on top of the 30= hour flight originally.
They got her off the plane and took her for a wee. she was running up to anyone that would talk to her. This was Easter Monday, and she went to her first show the Saturday, and won Best Baby Puppy in Show(4 to 6 months).
The second experience is of a puppy imported to Uk at 9 1/2 weeks where he spent 6 months in Quarantine. I visited him 3 times a wekk, bringing in a Radio st to Talk channels, then Loud Music etc.
His breeder had playsed noise tapes to thelitter, taken them visiting to freinds with kids etc, for maximum socialisation. the only thing they wouldn't have had too much experiuence of was heavy traffic, but luckily the Quarantine kennel block faced the road, with only a hedge between, and lots of different vehicles, including farm machinery went up and down daily.
Pup went to an Open show 3 days out of Quarantine where we his owners expected him to be overawed and diffident. He couldn't stop saying hello to anyone who would talk to him, human or canine, despite spending the last half of his Quarantine next door to two rather noisy GSD.
It of course took a while to housetrain and teach him house manners. He basically had the mind of a 9 week old and body of a 8 month old.