[quote=Gunsey'sMom;686126]....In some positions when he sits I think, OH MY, he really needs FOOD!....QUOTE]
When dogs are "sitting" they usually look thicker. If your dog looks really thin sitting, he probaby is.
You didn't mention how much per day you were feeding, how much exercise he gets, or what his body structure is.
If he is VERY active, you may need to up his food.