I know who sold her but she won't tell me who she sold the dog or puppies to
You can sue the person that took your dog as well as the as yet unknown person in possession as "John Doe" defendant which will allow you to take discovery to determine the identity of the Doe defendant and then amend your complaint accordingly. This requires a level of technical sophistication and you would be well served by consulting an attorney in your state to assist you with this matter.
Any answer provided on the AVVO website is for informational purposes only and does not constitute legal advice for your specific situation. You should always seek legal advice before taking any action which may affect your future rights. Your local legal aid office may well provide information or access to free legal advice and your state bar organization may provide referrals to reputable attorneys who will provide advice on a reduced cost basis.
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