Is he skinny? or just small structure?
Also agree with the 2 meals, he's at the age where you can typically move to once a day or twice a day feedings. But have you tried the 2 bigger meals earlier in the day and the smll meal in the evening? could be he is eating so much so late that he isn't hungry in the mornings.
Commander Charly Titan (GSD)-15 Jan 2010