Ruki has been blind for a few years after a chemical explosion in a research facility he worked at. because of his disability, he's now retired and works with Brynn, a fellow Border Collie, who is his seeing-eye-dog and long time companion. Ruki's loss of sight has led him to touching things more and more, mainly by chewing on them, to figure out what they are. Regardless of his loss in sight, he's still more than active and of course extremely clumsy.