The study, conducted by the Purina Pet Institute, ranked those cities that exemplify superior care, services and legislation for pets' health and well-being. It analyzed 30 different criteria ranging from veterinarian-to-pet ratios to incidence of obesity to rabies legislation. The top five Pet Healthiest Cities are:

1. Denver, Colo.
2. Oakland, Calif.
3. Portland, Ore.
4. Anaheim, Calif.
5. San Francisco, Calif.