Reign is a little doll baby. I would wait longer to have him neutered. I don't speak from experience because I've only had females, but I've read that particularly with males it's best to wait until their growth plates are closed. This is an updated report by Dr. Chris Zink about early spay and neutering. It applies to all dogs, not only canine athletes.
http://www.caninesports.com/uploads/...tions_2013.pdf