The most common and most likely answer to this crossword clue is the 10 letter word SCHIPPERKE
I've seen this crossword clue in The Times
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More clues leading to the result SCHIPPERKE
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The straight part
We know that "little dog" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case little dog = schipperke.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SCHIPPERKE mean?
SCHIPPERKE noun- A small breed of dog developed in Belgium, sometimes used as a watchdog on boats.