It is not normal for any dog to be missing digits, purebred or other wise. You need to contact the breeder immediately. I don't see that it would effect the quality of the dogs life, but any responsible breeder would want to be informed of this information. But seems rather odd to me that a responsible breeder would not have already known this prior to releasing a puppy to a new home.
He's your friend,your partner,your defender your dog.You are his life,his love,his leader. He will be yours faithful and true to the last beat of his heart.You owe it to him to worthy of such devotion
This is definitely NOT normal!! I mean it happens, but it is a congenital defect, possibly with genetic influence. If you bought a puppy just as a pet it should be fine, depends on which fingers are missing (if the middle-weight bearing fingers are missing the lamennes will be evident) but he will definitely compensate and will live with it just fine. But if you plan to breed him or show him then it will be a problem. Depends what you have the puppy for. If you want a breeding or show quality you have to tall to the seller. If you plan to keep the puppy you can go to your vet and make an x-ray to see which structures are exactly involved.