Establishing dog ownership when you have lost the papers
https://dogfilesweekly.fairmontdigest.com/posts/establishing-dog-ownership-when-you-have-lost-the-papers
If you've lost your dog's ownership papers, start by contacting the breeder, shelter, or rescue organization where you got them—they often keep records. Microchip registration, vet records, or even photos with timestamps can also help prove ownership. Some places accept a notarized affidavit from someone who knew you had the dog before you lost the papers.