Poodle or beagle (3)
I believe the answer is:
dog
I believe this clue is a double definition.
'poodle' is the first definition.
(thesaurus)
'beagle' is the second definition.
(thesaurus)
(Other definitions for dog that I've seen before include "'You cannot teach an old ... new tricks'" , "Domesticated canine" , "Shadow" , "Sort of collar, fight, days" , "Domestic animal" .)