<< inequity aversion was present already in the common—probably cooperative—ancestor of wolves and dogs and thus support the hypothesis of a close link of cooperation and inequity aversion >>
Jennifer L. Essler, Sarah Marshall-Pescini, et al. Domestication Does Not Explain the Presence of Inequity Aversion in Dogs. Current Biology, Volume 27, Issue 12, 1861 - 1865.e3 Publ. June 8, 2017 doi: 10.1016/j.cub.2017.05.061
http://www.cell.com/current-biology/fulltext/S0960-9822(17)30627-9
Sensitivity to inequity is in wolves’ and dogs’ blood. 08.06.2017