The info above is really worth-knowing. Like you mentioned the pup should be atleast 45 days old. I know someone who's selling me puppies which are just 1 and a half week old. that's the time when they should remain with their Mom. Secondly, the certificate just authenticates the breed not the healthiness of the pup. Before house-breaking, the puppy should be taken to the vet to insure it's healthy. The suggestion the mom should also be taken a look at is also good. But what's the gaurantee that the bitch they show is definetly the mother of the puppy I'm taking? If you know what i mean, there are hundereds outside to fool you into buying a wrong thing.