Special dog- I wouldn't do this but maybe I couldn't train it anyway! It just looks really hard on the joints to me. Mentally for the dog I see no issues. My dogs love a challenge, when we are hiking there are some rock faces I try to lead them around and mostly they won't have it and just go up or down without me seeing where they got a foothold.
The thing that worries me is the jump down- hard on the joints for any living creature.