Hello my bulldog cross puppy currently eats Purina pro plan savor with some generic wet food mixed in. I’ve been debating adding in a prescription diet for skin & digestion. Does anyone have awhich food could potentially help with allergies (ie how to compare Purina Dermatologic DRM vs Hills z/d or Hills Derm defense)? I’ve mixed in some cans of I/d with her food before and seems to agree with her system. I’m looking for ingredient and nutritional breakdowns and comparisons.