So true. I have 2 border Collies. I always thought the girl, Alice, was too skinny and Rory was just right. The vet corrected me and we reduced Rory's caloric intake until he was where he needed to be. Alice was spot on and the vet told me this perception is really common.an important thing to remember is, you WANT him to be a bit on the thinner side. Not knowing his actual body condition it's hard to say but I know that the majority of people think that pups should be round little butterballs. Actually, they should be on the thin side. A growing pup will go through stages where he looks downright starved but they don't last long. It simply means that more energy went into height/length and less into actual body.
Adults should actually have ribs visible, not like a washboard but defined definition.