According to the U.S. Department of Labor, Bureau of Labor Statistics, Occupational Outlook Handbook 2008-09 Edition, Animal Care and Service Workers at http://www.bls.gov/oco/ocos168.htm:
“Employment of animal care and service workers is expected to grow 19 percent over the 2006-16 decade, faster than the average for all occupations. The companion pet population, which drives employment of animal caretakers in kennels, grooming shops, animal shelters, and veterinary clinics and hospitals, is expected to increase. Pet owners—including a large number of baby boomers, whose disposable income is expected to increase as they age—are expected to increasingly purchase grooming services, daily and overnight boarding services, training services, and veterinary services, resulting in more jobs for animal care and service workers. As more pet owners consider their pets part of the family, demand for luxury animal services and the willingness to spend greater amounts of money on pets should continue to grow. Demand for marine mammal trainers, on the other hand, should grow slowly.
Demand for animal care and service workers in animal shelters is expected to grow as communities increasingly recognize the connection between animal abuse and abuse toward humans, and continue to commit private funds to animal shelters, many of which are working hand-in-hand with social service agencies and law enforcement teams."