
I would want more details, such has why, was this a stud fee pup for example, inother words was Dad there and the person sellign it was not the breeder but owns the stud.
Was the bitch on loan to teh breeder for the litter? This might be for example because the breeder had one they bred back to continue the line, as maybe her own couldn't have pups, or some such reason.
I wouod question it, and if all is above board they shoudl be happy to explain.
I would also contact the breed club and check the breeder out with them.