Humans aren’t the only ones waging a fight against fat. Man’s best, four-legged friends are waging the obesity battle too. According to the latest veterinary surveys, over half our nation’s dogs and cats are overweight. Enter fat camp, for dogs. At the Morris Animal Inn, in Morristown, N.J., overweight pooches are put on a strict diet and exercise regimen, which includes swimming, clocking serious time on the treadmill, yoga, and even pilates.