I've been feeding both my dogs Nutro Natural Choice Lamb & Rice (dry dog food) with good results. I just purchased a new bag last week and both dogs have had loose stools ever since. I heard a rumor that Nutro may have recently changed it's formulas and I swear that the kibble looks and smells a little different than the last bag. I contacted Nutro and they claim it has not changed, either way I'm planning on switching to Canidae. Is anyone else feeding Nutro and noticed any changes?