Olive Goes Grain-Free and Judges Me Every Morning

Olive has been my roommate for four years, and for most of that time he ate whatever was cheapest and looked perfectly happy about it. Then in March his ears turned red and he started scratching every night like a tiny drummer in a rock band. The vet near my condo ran a few tests and said his food was the likely problem, so we switched him to a limited-ingredient diet. I will be honest: the new food smells like wet cardboard, and Olive made his opinion known. For the first week he sat in front of the bowl, looked at me, looked at the bowl, and then looked at me again. I caved and mixed in a little of the old food, which the vet told me not to do, so I am not proud of that. Two months later the scratching has mostly stopped and his ears look normal. He still gives me that look every morning, though.