Obesity is the most common form of malnutrition in cats and dogs in the United States. It is estimated that 35 - 40 % of cats and 25 - 35% of dogs are obese. As in the market for human weight loss programs, there are multiple approaches to weight loss in dogs and cats. A study conducted at the Cornell University Hospital for Animals in 2001 determined an effective obesity management program involves a total wellness program comprised of three key factors as outlined in the Estra Diet Plan: an appropriate feeding regimen, an exercise program, and behavior modification for both the pet and the owner.