What foods do you feed your picky dogs?

Well i have an extremely picky dog when it comes to food and treats so iv been forced to starve since she didnt eat and now she she atleast eats her food but in very low quantities... but hey atleast she eats! iv been feeding her the kirkland brand but she eat as often so i switched her over to blue buffalo for puppies. She did better on the kirkland brand so im thinking of switching her food again. I really wnat to find her a food that she would love to eat. So im just wondering what you guys feed your dogs if they are picky?? Ive been thinking of buying Chicken Soup for the puppy's soul or solid gold. Of course buying a smaller bag to see if she likes it. Also, if my dog doesnt like her food, is it possible to return an open bag of food?