This is definitely one of the worst case scenarios a dog owner can imagine.
You'll see hikers boosting each other in an attempt to reach the dog. Some of whom slipped!
The situation drew quite a crowd of onlookers.
Eventually someone was able to reach the dog and bring him down the hill.
The video was published June 11, 2011 — sometime ago — but serves as a good reminder to always keep safety in mind while out on the trail.