If the pup had been intensely socialised it might not matter if you took it at 15 weeks old, but by 'intensely socialised' I would be wanting that pup to have travelled regularly in a vehicle, and been out and about to take in new sights and sounds, met different people and dogs: how many breeders would go to all that trouble? Not many. Many people who breed lurchers don't even let them out of the yard or run, and don't understand how important it is to use that 'early learning' window to accustom the pup to the outside world before that 'learning window' closes, forever in the case of pups of