Sure, it can be done for getting papers for the Puppy that is already an adult, but the process could possibly be more sophisticated and time-consuming than registering a Dog. Adult canine might be registered which has a kennel club or registry, however the proprietor will have to present documentation https://www.openpr.com/news/4286965/how-to-get-papers-for-a-dog-the-complete-step-by-step-guide