“In a mealtime challenge, the researchers set out a bowl of food for a high-ranking dog paired with a low-ranking packmate; they repeated this for pairs of wolves. In every pairwise matchup, the higher ranking dog would monopolize the food. The wolves, however, were able to eat from the dish at the same time. Occasionally, a dominant wolf would act mildly aggressively towards the subordinate, but a subordinate dog wouldn’t even try to challenge the dominant one.”

via Wolves Cooperate With Each Other, Dogs Form Hierarchies | IFLScience.