If I was to picture the kind of dog who could climb a mountain, it would be some kind of large, rugged, shaggy animal. I don't really know breeds, so I can't tell you the breed name, but I can tell you that it would not be a little guy like Darwin, here. And yet, Darwin is probably a better mountain climber than I am! (This of course is not surprising, I have climbed relatively few mountains in my life, and judging by his owner, Darwin has climbed many.) He was amazingly spry and gave me several much needed breaks while we paused to make sure he was finding his way over, under, and around the trail's obstacles. Thanks, Darwin! You're a pal.