Now and then, a photo comes along of such epic cuteness that no possible caption I could write would do it justice. Fortunately, somebody on Reddit wrote this explanation:
Mule nannies are used in Italy when grazing animals are moved from high pastures down to the plains. Newborn lambs are unable to make the journey own their own. They ride in pouches of a specially made saddle. At rest stops lambs are returned to their mothers for a meal & some nuzzling.
Submitted in epic fashion by Gigi the cat lady. UPDATE: More mule nanny photos here (thanks, AJ)!