Dave really loves food. Any time, any place, any kind of food. That's why so many of his investigations revolve around locating more food. Fortunately for Dave, there are many occasions when food is eaten in his home. Unfortunately for Dave, the majority of those occurrences don't allow Dave to partake in the eating. This is quite upsetting for Dave at times, but that doesn't mean he has stopped his efforts to eat more food. Take the example below, where Dave is investigating the aftermath of one of the meals that Dave was unable to enjoy. He is smartly trying to claim any leftovers that had not yet been eaten.
His hopes were dashed, but Dave will persevere. There can be no doubt about that.