note:
There are several versions of this fable. The central theme of each concerns a haughty horse who disparages the lowly ass and thinks much of himself. (Or a mule who refuses to come to the aid of the ass.) In each version the details differ. In one version, the one told by Babrius (Perry B&P, p. 3, no. 7, Perry 181. L'Estrange, p. 140: A Laden Ass and a Horse, Townsend 50; La Fontaine, Le Cheval et l'Ane), the Ass asks the horse (or mule) to share is burden because it is so heavy he will die. The ass does die and their master loads the entire load, including the skin of the ass onto the horse. The moral of this fable is that you end up being treated to what you deserve.

Another version -- told in the Steinhöwel and derivative translations -- revolves around a turns of fortune. The ass and the horse pass each other on the road. The horse is finely arrayed with a fine saddle and bridle. The horse is haughty to the ass. Time passes, the horse gets weak or sick and is put to work pulling a dung-cart. The ass recognizes him in the field and chides him for his former boasts of superiority. (Perry 565 L'Estrange, p. 100). This is the version told in the text of the de Tournes/Salomon Fable No. 33, above.

A third version (Perry 357)  Bewick (p. 327) tells a variant of the above. Instead of becomming sick, the horse is wounded in the eye during a military campaign and is placed in pasture.