its better to have some patience before purchasing a pup ..
try to find out what is basic characteristics of that breed ..
then just try to differenciate between then ..
like by there head , structure , jaw , height, length , type of coat , markings , and all ..
predigree details is necessary .. becoz there is no surity that pup going to like his champ dam an sire ..
but the probability to become a good dog like his parents is MORE ..
u should the breeder of kci papers , pedigree , should personaly view the parents of the pup .. after satisfying then try to proceed the deal further ..microship , sellers selling letter, vaccination card and all ..
try to find out good and analyse the through its age , weight , health type etc