Pug dog? (5)

I believe the answer is:

boxer

I believe this is a double definition.

'pug' is the first definition.
(thesaurus)

'dog' is the second definition.
(boxer is a kind of dog)

(Other definitions for boxer that I've seen before include "one that's accustomed to fighting" , "canine" , "Asian rebel" , "Prizefighter" , "Person assisted by a second" .)

I've seen this clue in the Sydney Morning Herald and The Telegraph.

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