This year's biggest loser is Dennis, a Columbus, Ohio dachshund that has lost more than 75 percent of his old body weight.
This Yahoo! News article explains how two years ago Dennis, an incredible 56 pounds, could hardly take more than a few steps and faced many health concerns. His owner at the time fed him White Castle burgers, pizza and didn't pay attention to the dog's expanding girth.
Brooke Burton, a nursing student, was very upset when she saw her relative's dog and persuaded them to let her adopt the dog. Burton dieted the dog down with a dry dog food diet, lots of walking and affection to a svelte 12 pounds. Burton said that with the weight lose, Dennis gained energy and personality.