There really is no reason a pup would have to go home with you at 6 weeks. Even if the mother of the pup has passed, the breeder would be better off taking care of the pup for absolutely no less than 2 more weeks. It may work out or you may be asking for a world of trouble financially and emotionally. No matter how tempted you are to bring that precious baby home, please see if it can stay longer with the mother, siblings, and breeder. If the breeder "insists", look for additional signs that something is wrong. Wishing you the very best and a healthy pup!