Pet Sitters International is a leading educational organization for professional pet sitters, providing resources and support to help pet sitters build and grow their businesses. With over 40,000 members since 1994, PSI offers a range of services including insurance, continuing education, and a network of other pet-sitting business owners. By becoming a PSI member, pet sitters can gain access to group-rate insurance, discounts on background checks, and subscription to Pet Sitter's World magazine, among other benefits.