File:DogFairnessComposite.jpg

Summary
A composite image consisting of three photos provided by the Proceedings of the National Academy of Sciences, showing an experiment conducted between two dogs as their unidentified owner stands behind them.

In the first image, Subject A (dog on the left) gives his paw to an unidentified experimenter, who does not give him a treat for having done so. In the second image, Subject A watches as Subject B (dog on the right) is given a treat for giving his paw to the experimenter. Image 3 shows Subject A refusing to give his paw or look toward the experimenter.

Scientists believe experiments similar to this one show that animals have a basic understanding of fairness.

Image #1: AP Photo by Friederike Range, found at: DayLife.com, All contents © copyright 1999-2008 Getty Images, Inc. All rights reserved.

Image #2: AP Photo by Friederike Range, found at: DayLife.com, All contents © copyright 1999-2008 Getty Images, Inc. All rights reserved.

Image #3: AP Photo by Friederike Range, found at: DayLife.com, All contents © copyright 1999-2008 Getty Images, Inc. All rights reserved.