KitKat: I would see if you could find a sample of Solid Gold cat food for this little one.
Food allergies can come and go at any age, and form to just about anything.
Solid Gold is one of the best, it has no normal ingredients which cause allergys (chemical preservatives, beef, corn, etc).
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Solid Gold specializes in the development of "non-allergenic" products. Solid Gold always uses wholesome USDA Choice lamb and beef meal, USDA grade I and II grains, and healthful monounsaturated and polyunsaturated oils. They never use chemical preservatives such as BHA, BHT and Ethoxyquin. Solid Gold never uses wheat, corn or soy. Animal or poultry fat is never added to their products.
Lamb Meal, Menhaden Fish Meal, Ground Millet, Ground Brown Rice, Ground Barley, Rice Bran Oil, Canola Oil, Flax Seed Oil, Amaranth, Rice Bran, Garlic, Blueberries, Yucca Schidigera Extract, Taurine, Carotene, Choline Chloride, Calcium Carbonate, Vitamin E Supplement, Iron Proteinate, Vitamin A Supplement, Zinc Proteinate, Niacin Supplement, Folic Acid, Thiamine, Pyridoxine Hydrochloride, Manganese Proteinate, Copper Proteinate, Ethylenediamine Dihydriodide, Natural Flavors Added.
Crude Protein (minimum) 34%
Crude Fat (minimum) 12%
Moisture (maximum) 10%
Crude Fiber (maximum) 5%
Here is another one people have used to fight allergies in their pets.
Holistic Blend
At Holistic Blend we are dedicated to providing your pets with the finest in natural foods and health care products. All of our ingredients are third party tested. We use only top quality, non-allergenic ingredients.. free from pesticides, hormones, antibiotics and chemical preservatives.
Low ash chicken meal, ground brown rice, chicken fat (preserved with rosemary extract) hulless barley, chicken meat, soy protein, millet, salmon meal, flax seed, dried whole egg, phosphoric acid, amaranth, alfalfa, cranberries, apples, garlic powder, cinnamon powder, rosemary, potassium chloride, nutritional yeast, choline chloride, L-lysine, potassium sorbate, dicalcium phosphate, yucca shidigera, vitamin A acetate, vitamin D3, vitamin E, ferrous sulphate, taurine, zinc oxide, zinc proteinate, niacin, copper proteinate, manganese oxide, manganese proteinate, calcium pantothenate, sodium bisulphate complex (source of vitamin K), pyridoxine hydrochloride, vitamin B12, calcium iodate, folic acid.
Crude Protein (min) 32%
Crude Fat (min) 18%
Moisture (max) 10%
Crude Ash (max) 6.5%
Omega 3 Fatty Acids (min) 4.5%
Crude Fibre (max) 3%
Omega 6 Fatty Acids (min) 0.61%
(Edit) :: Opps! And yes, Compairing Felidea and Chicken Soup adult, Felidae is better, ingredient wise.