The most common and most likely answer to this crossword clue is the 10 letter word POMERANIAN
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More clues leading to the result POMERANIAN
Buddy explains!

The straight part
We know that "dog" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dog = pomeranian.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 POMERANIAN mean?
POMERANIAN noun- A native, or inhabitant of Pomerania.
- A breed of small, fluffy, energetic toy dogs in the canine family of spitzes.