B-bird dog (6)

I believe the answer is:

beagle

'dog' is the definition.
(beagle is a kind of dog)

'b-bird' is the wordplay.
'bird' becomes 'eagle' (eagle is a type of bird).
'b'+'eagle'='BEAGLE'

(Other definitions for beagle that I've seen before include "Breed of dog in a glebe" , "Small short-legged hound" , "5 [MANS BEST FRIEND]" , "hunting animal with smooth coat" , "HMS - was Darwin's ship; hunting dog" .)

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