I don't really know, but have a question along the same lines..I feed Jo around 2 cups a day. It just doesn't seem like a lot..shes not under weight, if anything maybe a little over. I'd say pretty close to average. If we're out somewhere, and someone gives her a treat, she like grabs at it like shes STARVING. The people look at me like..Do you not feed your dog?? your mean! or something, some ppl have actually said the 1st part to me. I can't seem to get them to understand labs are like that. Should I be feeding more then I am?? Same with my other dog. He is older, and smaller, doesn't get much exersice (he gets tired) I feed him a little less. He's really skinny, but has always been like that. Before we got Josie, we'd leave food out for whenever he was hungry. He's like skin and bones though, and he eats whenever given too. Well maybe not skin and bones, but isn't fatty at all. Is this because he's old??? Or should I feed him more?