Dog with older tiger, never excited (6,9)
I believe the answer is:
golden retriever
'dog' is the definition.
(golden retriever is a kind of dog)
'older tiger never excited' is the wordplay.
'excited' indicates anagramming the letters.
'older'+'tiger'+'never'='oldertigernever'
'oldertigernever' anagrammed gives 'GOLDEN-RETRIEVER'.
'with' is the link.
(Other definitions for golden retriever that I've seen before include "Dog" , "pet?" , "canine" .)