Which non-regular obedience class is NOT listed in AKC regulations?

The Professional Handler Class is indeed not recognized or listed in the AKC regulations for dog obedience classes. This classification suggests a competition platform that is focused on handlers rather than the dogs themselves, which does not align with the AKC's guidelines that typically emphasize qualifications and performance of the dogs.

The other options refer to recognized classes within AKC obedience competitions. The Graduate Open class is an advanced level that allows dogs to demonstrate more intricate skills after having mastered earlier levels. The Versatility class is designed to acknowledge dogs that have achieved titles in multiple areas, showcasing their overall versatility in obedience. Veterans classes provide a competitive avenue for older dogs that have attained titles in obedience, allowing them to participate in a class tailored for their age group while still honoring their past achievements. Thus, the recognition of these classes by the AKC highlights their structured approach to competitive obedience and ensures that all levels of skills are accounted for in the sport.