Possible Clues:

• Dog might be trained someday
• Siberian dog with a thick white coat and curled tail
• Appeal, instant, the solver once had, but not setter!
• Dose may upset Siberian dog
• South American dictionary describing unknown dog
• Dog someday must be trained
• Midsized Siberian dog
• Flash on you, blue collars for dog
• Breed that's a ''someday'' anagram
• Supposing Miliband embraces twinkling 15 Down?