I read somewhere that dogs understand fairness. Mine certainly do. They are like little kids, where if there aren't an equal number of treats every time, they will complain and pout like kids.
Because Spot is a slow eater, Ty finishes his dinner in his crate usually about a full 5 minutes before his mommy, Spot. Because he finishes so much sooner than her, he thinks it's because that dinner was portioned unfairly, and he got shorted. Suddenly there is injustice for dinner.
So, now he looks at me, looks at spot, looks at me and whines every time we reach the "Ok, now I'm SURE she got some of mine." part of the meal.