This is a relatively recent story that made the news. It also brings much debate over the actions of the owner and if he should be charged.
Man Faces Animal Cruelty Charge After Abandoning Dog on Colorado Mountain - ABC News
As a dog owner I understand having to leave the dog where it was in order to get back down the mountain, but I would then call whoever I had to in order to help the dog, much like the hikers did who found the dog. It is easy for us to say that the dog should have never been on such a dangerous hike/climb, and I agree. However, I almost always take my dog for a hike when I go and I am put in far less dangerous situations and environments and there are times when I think something could easily go wrong. Luckily, I'm always prepared.