
Presumably, you would (or have) registered the puppy with your affix as a prefix. To add the stud owner's affix, I think you would have to transfer the puppy to her ownership, she could then add her affix as a suffix & you could then transfer the puppy into joint names (nice little earner for the KC!) If the stud dog owner happened to have bred both the dam & the sire then you could have both names as affixes. There may be another way, but I'm not aware of it!