Possible Clues:

• Cartoon canine
• 2006 demotion
• Second smallest planet
• Body recently demoted from place ordered out
• Astronomical discovery of 1930
• Left in place old Disney character
• Disney pooch
• Cicero is taken from police court by mythical figure from the underworld
• Demotion in 2006 news
• It was downgraded in 2006