PATTI J. MORAN developed pet sitting as a profession after starting her own pet-sitting business in North Carolina in 1983. After word of her business spread to other parts of the United States, Moran was prompted to put her how-to advice on paper; the premier reference, Pet Sitting for Profit, was published in 1987. Shortly thereafter, requests for her pet-sitting business forms led to the start of Patti Moran's Products for Professional Pet Sitters. As others joined her in the profession, Moran began the National Association of Pet Sitters in 1989 and also founded Pet Sitters International in 1994. With more than 7,500 members, PSI is the largest association of professional pet sitters in the world.