
Hi,
You can't rename your puppy. He has his name, and that's it....except!! if you get an affix (for which you have to apply to the KC and submit alternatives, pay an application fee and annual maintenance fee) which you can pay to add to his original name. However, it is the breeder of the puppies (the owner of the bitch, not the dog) who registers the litter, and they would be registered with
her affix, not yours. If you owned the bitch, of course, you would be the breeder, and the pups would be registered with your affix and the names you chose (if they were accepted by the KC).
Hope this is clearer than mud....
:)