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1. The Dog Star, or brightest-appearing star in the heavens, located in the constellation Canis Major
2. A more recent reference to Sirius is Sirius Black from the Harry Potter series. Sirius Black is Harry Potter's godfather. We have a black Portuguese Water dog puppy and named him "Sirius Black" both because of the astrology reference as well as the association with Harry Potter. The Harry POtter series is much loved by our kids.