There's a thread where you can email companies and get some samples (some free) to try. The list is in the Heath and diet section.
http://www.yorkietalk.com/forums/yor...e-samples.html
I have a very picky eater. She tried a ton of things, but she settled on Chicken soup for the puppy lovers soul, and holistic tiny bites for kibble, but we use merricks grain free wet food on top the kibble. I think we tried maybe 10 kibbles before we found some she liked. Oh, and whatever she likes to eat 1 day can be something she refuses to eat the next. LOL! I keep a variety of the wet food to mix it up for her( give her a change)- and freeze what's in a can for use like a week or 2 later. (I freeze 1/2 a can if she's refusing to eat it, it saves us a little money that way)