To be honest, you've hit the bottom of the barrel in terms of dog food. It would be difficult to find another food as low in quality as Ol Roy! (google is your friend
Corn is the main ingredient, which is a common cause of allergies in dogs, sometimes manifests in skin symptoms. The rest of it ain't that good either!
That said, if he were my dog, I would do two things...
1) Take him to the vet for a skin scraping to check for mange mites
2) Change foods to a much higher quality food.
Many folks around here recommend Taste of the Wild, as a good quality food at a reasonable price. There are many options. There are lots of threads here about food.
Just one more thought... feeding a low quality food is like raising your kids on McDonalds and a vitamin pill. Yes, it will keep the kids alive, and they won't have any obvious nutrient deficiencies, but in the long run, they are going to have huge health problems.
Investing in quality food now, and throughout your dog's life, will be worth it in terms of health and happiness, and probably less vet bills too!