I have been feeding my three year old, 12 lbs, male shih tzu exclusively on grain free canned food for about six months now and he seems to be doing very well. He usually eats about 6-8 ounces per day. I currently feed Innova EVO, Wellness CORE & Blue Wilderness. I have looked at adding a couple others to the line up from Evanger's and Merrick. Is there anything that I should be concerned about feeding this type of diet? I am not ready to jump into a raw diet yet and I have a really hard time believing that dry kibble can be good for a dog in the long run. Thanks in advance.