Fairness

This is kind of interesting, but I'm not sure of what it means:

Dogs’ innate sense of fairness being eroded by humans, study suggests - It was thought dogs learned their sense of justice from their human ‘best friends’, but tests on wolves show they have a stronger reaction to unequal treatment than their domesticated cousins

To understand what they are suggesting, you'd need to see the paper to see what tests were carried out and what and how comparisons were made