Bought a bag of the Nature's Domain Salmon and Sweet Potato grain-free dog food at Costco to try (only 80 cents/pound)!! Our dogs don't have problems with grains but it seemed like a good food to rotate, especially with the awesome price.
So far, so good! Seems like a great food. Smells good, dogs have had no problems adjusting, poops are firm and a bit smaller in volume (which tells me they are digesting more of it, and therefore would eat less, meaning even more $$ saved!) Dogs love it (but they love any food, any time!)
Their last bag of food was Canidae, and I try to rotate every few months (usually between the Canidae varieties, and Wellness or others when it's on sale since they are so darned expensive). I have not had them on a grain-free food before.
Hope that helps out anyone wanting to try it!