
Why do you want to use him for breeding? Has he had all necessary health checks & do you know the health history of his ancestors? 6 is old to be embarking on a stud career. First step would be to contact his breeder - assuming that they are responsible people, knowledgeable about the breed. Also contact some of the breed clubs listed at the bottom of the page
here Ask yourself why someone would use him rather than a successful, proven sire and if you want to live with possible behavioural changes is he was successfully used.