[cdawnfine]

Ok, so I am by no means an expert however there is a large amount of yorkies that have problems with corn and chicken there is the ingredients of puppy chow
Ingredients
Whole grain corn, corn gluten meal, whole grain wheat, chicken by-product meal, animal fat preserved with mixed-tocopherols (form of Vitamin E), soybean meal, brewers rice, meat and bone meal, barley, beef, sugar, animal digest, sorbitol, fish oil, phosphoric acid, salt, tricalcium phosphate, potassium chloride, sorbic acid (a preservative), dried carrots, dried peas, calcium propionate (a preservative), L-Lysine monohydrochloride, added color (Red 40, Yellow 5, Blue 2), Vitamin E supplement, choline chloride, brewers dried yeast, zinc sulfate, zinc proteinate, ferrous sulfate, manganese sulfate, niacin, manganese proteinate, Vitamin A supplement, calcium carbonate, Vitamin B-12 supplement, DL-Methionine, calcium pantothenate, copper sulfate, copper proteinate, thiamine mononitrate, garlic oil, pyridoxine hydrochloride, riboflavin supplement, Vitamin D-3 supplement, menadione sodium bisulfite complex (source of Vitamin K activity), calcium iodate, folic acid, biotin, sodium selenite.
H-4037

I too learned that just like everything else in life just because the manufacturer says it is hight quality does not make that true. You might want to go to the diet forum here and see what others are feeding. I feed Natural Balance. If you can post a picture of the skin maybe someone will know what it is.