You can drop the lunch feeding. If he looks good keep him at the same amount. So that would be 1 1/2 cup for the first feeding and 1 1/2 cup for the second. Amounts vary in each dog. You really need to know what they should look like at their ideal weight. You need to adjust their food according to their weight. They will also need more or less during different times of the year or different growth spirts. My dogs burn off a lot more in the summer due to swimming everyday. My pups sometimes eat like a growing teenager. My two older girls never ate the same amount. One looked perfect at 2 cups a day while the other needed 3. I don't care for the recommendations on the food bags. My brother-in-law refuses to lower his dogs diet because the bag says to feed her more. The dog is 20 lbs overweight. He just says she is a big girl. I tell him she is a big girl but she should not be that big. So give them what they need but always step back and make sure they look fit.