My Lexie has been a picky eater too. No problem eating a pine needle, and other stuff that is not food.
I recently started her on honest kitchen preference dog food and she inhales the stuff, looks at me like saying, more, more, paaahhleasse. I am relieved to have found something they all like and will clean their bowls. The best part is I add the cooked meat, so I don't have to worry about what is in the dry kibble, by products, etc. yeaaaa!