It doesn't, really. It's the same colour, and clearly a spitz breed, but it's not a shiba. Though I have seen people adopt dogs that look just like this and tell you that it's a shiba "with a strange coat."
Ok. It's not impossible. But as for the dogs in these pictures, they're not shibas. They're Icelandic sheepdogs.
I've been looking at them for a while because I worry about what to do when Tinky-Winky dies. I can't imagine having no dog; I can't imagine having a dog that doesn't look like a shiba; and most of all, I can't imagine taking that much lip from someone other than my precious. So... maybe the Icelandic sheepdog will be a valid compromise. But hopefully I won't have to find out for many years yet.