Question

A barking dog never bites. (translate in good marathi)

Answer 1

कंटाळवाणे कुत्री क्वचितच चाव्याव्दारे

Kaṇṭāḷavāṇē kutrī kvacitaca cāvyāvdārē(in Marathi)

hope it helps you
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Answer 2

It is a popular English proverb.

It signifies that loud proclamation will hardly follow sound action.

The truth is if a dog barks vehemently, it hardly can be dangerous.

Alternatively, it can be said that a barking dog hardly bites or the dog that barks less, can be extremely dangerous.  

Similarly people who speak can hardly be a good performer.