jacksonflugie

does anyone know if there is any relationship between the kind of dog food you feed and hotspots, i have recently changed my dogs food and all of a sudden they have developed red raw spots on their back and tails, they are constantly itching and they don't have fleas, i had been feeding them and indoor complete formula then switched to a all natural kind, when they developed the spots, i switched them back recently but was just wondering if anyone knew how to get rid of these or if it had any relationship to the food,