As with horses, donkeys also need to be trimmed on a regular basis. This is a little over a years worth of growth. At this stage it is possible to take a dramatic amount off hoof off and still create a nice little hoof. This kind of work is never perfect however, it is merely a way to do damage control before the hoof capsule is permanently changed.
Old Quarter Horse
The toe of his hooves is still a little long in this photo, I wasn't able to bring it back any more without risking soreness.