Im so sorry that Bunjee is sick. He will get better soon with the antibiotics. regarding the itchy and flaky skin, did you ask your vet?
Gucci had flaky and itchy skin when I was feeding her Nutro max. I switched her to Natural Balance and added Omega 3 to her food. I aslo used Oatmeal shampoo on her. She didnt like the Natural Balanca and decided to try Canidae. She doesnt have flaky or itchy skin anymore.