I fostered a terrier mix a few years ago that my SO found by the side of the road in the rain: skinny, traumatized and completely hairless in places. My vet put her on Apoquel because she was itching herself so badly. My vet wanted her on some Royal Canin kibble which I dutifully purchased, but I eventually put her on raw, and was able to gradually wean her off the Apoquel. No more itching. She was adopted by a mother and daughter, who send me photos from time and time. The little dog is still on raw, and no itching and quite a coat.
Raw feeding is no panacea. But having fed raw for quite a few years, I would never willingly go back to kibble. I have 6 Australian shepherds ranging in age 11 to 1.5 all on raw. No allergies, food sensitivities, none of them have needed dental procedures or even dental cleanings, no pancreatitis, no kidney disease, no UTIs, yearly blood work all normal.
The seat of the immune system is the gut. If I had a dog with food allergies or sensitivities I would look to raw or home cooked rather than highly processed kibble.