Possible Clues:

• Four-legged Emerald City visitor
• Talking beast in a 1917 novel
• Fictional Kansan canine
• Baum bow-wow
• Exposer of the Wizard of Oz
• ''Wizard of Oz'' pooch
• "The Wizard of Oz" pooch
• "Stranger in Town" rockers
• Completely, after "in"
• Screen pooch of 1939