My allergic dog and food woes?

My pitbull Jayde has really bad skin allergies. She chews on her paws and gets really bad hives all over. We starting feeding her Innova Evo brand dog food and all of her symptoms completely went away. We tried a raw diet and it actually made her allergies worse so we went back to Innova. It takes a few weeks for their stomach to ajdust to the food because it's higher in protein. We pay about $60.00 for a 32lb bag and feed both if our dogs twice a day. I think the bag usually lasts about a month. Hope that helps!