Croup and Rump
As compared to a horse the rump of a Donkey has a sharper, more sloping croup. The pelvic bones are at a higher angle, therefore the Donkey croup is higher and rump narrower. The rump should be strong and gently sloping. There should be good length from point of hip to point of buttock.
The hindquarters provide most of the Donkey's impulsion and they act as pistons to thrust the animal forward. A thin, "Goose Rump" can indicate an animal is in poor condition, may appear out of proportion and may reflect weak conformation.