My male dog is not a big eater. He will eat just enough to fill his stomach and then turns his nose up. I have been trying to put lots of high energy into smaller packages (like oils and fats) to put a bit of condition on him. So far I haven't had any improvement. My bitch was the same as him at this age and has now come around and started to eat heartily and fill out. Should I let natural processes play out or is there some other way I can get my dog to look less like a supermodel?