This morning I saw on Dr. Oz an overweight woman with two overweight dogs. The guest vet on the show was talking about feeding and not to let the dog eat freely throughout the day, but to schedule and measure the food. The vet had a product on the show that was a ball with the measured kibble inside and said, "make the dog work for it." I've not seen this kind of contraption before. My take is it would be good for adult dogs. There is a hole in it, where the kibble comes out one at a time, which is the reward for the dog having to roll this ball around. Anyone use one of these? And if you do, what are your thoughts?