Wow-itching is rough!
There are fleas and since you are in the south you probably have more around due to weather?
But he's awfully young-I don't know enough about food allergies and environmental allergies to really say. Would the breeder talk to you about any issues with skin/itching they have with their dogs?
Does he wear a collar? Flea collar? If flea collar, take it off.
I ask about the collar because one of my dogs has a crap fit when he has to wear his collar. He scratches and scratches. Collar off, no scratching.
Is it possible he's sensitive to something in the food? I don't know-it has chicken, my two GSDs don't handle chicken well...but...I hope someone else comes along to see this!
OH-maybe a fish oil would help? Or coconut oil? If you want your head to spin and maybe even get dizzy-there is a thread in the food section about coconut/fish oils.