"Owner who left it there wants it back"
My initial thought was anger/upset that someone not only brought the dog up there, but then abandoned it there. But if you read the news article, the owner states he had to leave the dog up there for the safety of a younger hiker because a storm rolled in. I completely understand why he had to leave her up there, and one part of me thinks the hikers that rescued the dog are being a little harsh on him... but on the other hand, he shouldn't have brought the dog on that mountain in the first place. The other hikers keep stating "he made no attempts to get the dog back", but honestly, some people don't have the online resources that other people have, so maybe he just didn't know how to go about seeking help? Heck I've posted for help/advice online before and hardly get any responses.
Don't just watch the video, read the article, too; the video leaves out some information.