How to Build a Complete Record for a Dog Without Papers
https://caninepaperwork.alderbrief.com/posts/how-to-build-a-complete-record-for-a-dog-without-papers
Start by gathering any vet records, microchip numbers, and photos from different angles. Talk to neighbors and former owners who can confirm the dog's history. Write down known birth date, breed mix, and distinctive markings. Contact a local rescue or AKC Canine Partners to ask about creating a credible paper trail from the information you already have.