Hello, I have a German Spitz (mittel) dog named Harvey. We purchased him from a German Spitz breeder when he was 3-4 years old. We didn't get any papers etc but we know he is pedigree. He is now roughly 10-11 years old and still very much active like a pup and fully healthy. We are wanting to stud him with another female German Spitz so we can have and keep his or some of his off springs, we are aware that maybe he doesn't have long left in him (we hear spitz live between 13-16 years) and we really want his off springs rather than purchase a random pup. Is this possible at his age? What is required?