Thank you for all the wonderful responses, I'm doing a blend of all the suggestions. I right away scheduled X-rays for OFA and CERF exam, I e-mailed and left phone messages for both parties that they could potentially still be liable for anything the dog does and for his care - they responded right away and said they've never received new AKC certificate which I ordered for them to sign; SO I told them that I would send out a letter for them to sign with a SASE which they both agreed to sign and send back:) I'll just keep praying until it's all done :)

Thanks so very much for all the useful suggestions!