It's not fair!

I am devoted to my nieces and nephews but they all know that one thing I can't stand is complaints of "It's not fair!" With my eldest nephew, I simply leave the room (like my grandmother who never really believes I will hang up on her, he always seems surprised when I actually depart). So it is somewhat disturbing to learn that dogs have an intuitive understanding of fair play and become resentful if they feel that another dog is getting a better deal . . . Is there nowhere to hide? Let us hope they are more accurate/sparing in their assessments of such situations!