My GSD (Buck) is 9 months old, and about a month and a half ago, started getting quite itchy, and scratching himself a good bit more than usual.
There are only two places where he scratches/bites (on both sides of rib cage), and as a result, has developed a few bald spots. I have taken him to the vet, he has all his shots, immunizations, triflexis, etc. His diet was switched from raw meat diet to chicken quarters while he was gone for four weeks during training. I kept him on his new chicken quarters diet, and about a week or two after training, he started the scratching nonsense.
Here are a couple of pics: