How to Prove Ownership When You Don't Have Breeder Papers
https://thefamilydogrecord.clearminster.com/posts/how-to-prove-ownership-when-you-don-t-have-breeder-papers
If you're trying to prove your dog's lineage without breeder papers, start with any vet records showing the puppy was examined with the dam at a young age. Photos of the litter and mother nursing or playing together are strong evidence too. Registration with a legitimate kennel club or microchip records tied to the dam can help. Finally, written statements from the breeder or anyone who witnessed the birth can carry weight, especially if notarized or witnessed by a responsible party.