Dog barking longer, tired always (6,9)
I believe the answer is:
golden retriever
'dog' is the definition.
(golden retriever is a kind of dog)
'barking longer tired always' is the wordplay.
'barking' indicates an anagram ('barking' can informally mean mad).
'always' becomes 'ever' (synonyms).
'longer'+'tired'='longertired'
'longertired' is an anagram of 'goldenretri'.
'goldenretri'+'ever'='GOLDEN-RETRIEVER'
(Other definitions for golden retriever that I've seen before include "canine" , "pet?" , "Dog" .)