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All answers having "Dirty dog" as clue:

3 Character Answers:

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CAD

CUR

RAT



4 Character Answers:

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SLUR



5 Character Answers:

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LOUSE



6 Character Answers:

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MEANIE

ROTTER



7 Character Answers:

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SOANDSO



8 Character Answers:

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SCALAWAG



9 Character Answers:

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SCOUNDREL

SLEAZEBAG