Reading through posts, it always strikes me as odd when people recommend diet food for dogs? Mine are on BARF in any case, and if I think they look a little lean, I up their food, and vice versa. I've never had a problem with any of my dogs, in fact with the last oldie I took on, she needed to lose weight, so I just dropped the portion sizes. She couldn't be exercised too much, she had an odd gait from being underexercised and just growing old, and yet she managed to trim up nicely. I'm genuinely interested in whether dog diet food is necessary, or is it just another product to put on the shelves to tempt us to part with cash? Me being cynical have always believed the latter, pretty much the same as with human diets, its what you put in that counts, diet and exercise are the only things that work in trying to control weight.