They've lost me on this one--I can see why an *effective* diet drug for humans would be a good thing, since we are free to eat whatever we want, and not to exercise, and for some people, given these choices, obesity is almost inevitable. But diet drugs for humans are pretty ineffective, so far as I know, so I don't know why we'd expect one to work for dogs. And, wouldn't the 'green bean' diet and a little more exercise be *much* better for dogs, since their human pals can control the dog's diet and increase his or her exercise? Seems like that would work jut as well for the 13 year-old arthritic dog as a drug with multiple side effects--a little gentle exercise might even help the arthritis, and the old one might get a little extra fun and attention!