I think he looks perfect. You should feel , but not see his ribs I believe? Mine always stayed lean like that until after 2 years old. He is gorgeous.
We feed BB Wilderness but are switching to TOTW to see if we get firmer stools.
While we choose to buy quality food , I agree with what the previous poster said. I have had some healthy long lived dogs throughout my childhood and younger year. My GSDs in the 70's and early 80s got Gravy Train , and whatever food the kids dropped on the floor lol . Healthy , did CGC with them , they lived to 13 and 14 1/2 .
Now that I know better , I am all for higher quality food..but sometimes when I start agonizing too much( like with this recent switch) I remember Pax and Bear who were the best dogs , uber healthy , even without the added benefit of high quality food.