Scout is like this too. She sometimes eats late or not at all. We have switched her food once and she went crazy over the new food. Then after about a week it was back to only eating it occasionally. My wife wants to switch food again, but I think that she will love it for a week and then get tired of it. I know she isn't going to starve herself just because her food is boring, so I only get worried if it goes on for a few days in a row. Usually if she doesn't eat one day she will the next because she will be hungry.