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All answers having "Top dog" as clue:

3 Character Answers:

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CEO

RHO



4 Character Answers:

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BOSS

EXEC

HEAD

MUTT

ONER



5 Character Answers:

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ALPHA

CHAMP

CHIEF

MRBIG

PREXY



6 Character Answers:

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BIGGIE

HONCHO

KAHUNA



7 Character Answers:

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KINGPIN

THEBOSS



9 Character Answers:

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ALPHAMALE

BIGCHEESE

BIGKAHUNA

MISTERBIG

NUMBERONE

NUMEROUNO



10 Character Answers:

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BESTINSHOW

HEADHONCHO

HIGHPRIEST



11 Character Answers:

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GRANDPOOBAH

HISHIGHNESS



13 Character Answers:

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KINGOFTHEHILL



14 Character Answers:

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BESTOFTHEWURST



15 Character Answers:

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LEADEROFTHEPACK

PICKOFTHELITTER