I feed all my crew Nature's Logic. I have Yorkies ranging from 3 to 12 pounds with activity levels that go from very active to a little lazy. They all thrive on the Nature's Logic. I also wean all my pups with it.
Nature's Logic has a unique formula in that it is the ONLY food that doesn't use chemically synthesized vitamins and minerals. If you read the ingredient list, it's all food, along with healthy bacteria and digestive enzymes. Compare that with any other food and you will find that all other brands use added vitamins and minerals. What's troubling to me is that the primary source for these vitamin and mineral compounds is China and the fact that using added vitamins and minerals is an admission that the food values alone aren't good enough to meet AAFCO standards.
Nature's Logic comes in 5 varieties (beef, chicken, lamb, venison and duck/salmon) so it's easy to rotate flavors to prevent boredom with the food. Also, you can get it in kibble, canned or raw.
Here's a link to their website if you want more info...
Nature's Logic