NAPPS is a member association for full- and part-time pet sitters.  NAPPS is the only national nonprofit US trade association for individuals with pet sitting businesses.  It is operated for and by its members.  Other national pet sitting organizations are for-profit.  NAPPS also provides many tools and resources to its members at no additional costs.

NAPPS certification

The NAPPS Certification Course covers topics relevant to pet sitting, pet care, health, nutrition, behavior, safety and pet first aid for a variety of animals