I have been wondering the same thing-- I have never seen Lucy turn down a meal or treat. We have friends and family with a doberman, newfie and mutts and none of them are particularly food driven. When we visit them and its feeding time, I have to keep Lucy away from their food because she will gladly finish it when they walk away. I have also noticed that they can be distracted while they eat whereas Lucy is single minded when there is any food around.