Certainly, it can be done to obtain papers for a Pet that may be presently an adult, but the method might be additional sophisticated and time-consuming than registering a puppy. Grownup dogs may be registered which has a kennel club or registry, even so the owner have to supply documentation https://www.openpr.com/news/4286965/how-to-get-papers-for-a-dog-the-complete-step-by-step-guide