Here's the animal loving Molly Sims as she demonstrates ways to keep your pup fit and healthy. She's at the launch of the PetFit Challenge which is a new tour that's starting where the famous celebrity trainer Gunnar Peterson shows everyone how to keep, not only yourself fit, but also your pet pooch (don't worry cats are included too). Would you pay a trainer to help keep your animals healthy weight wise? If so you'll be happy to know Gunnar is going to open some classes in Los Angeles.There's always the park...