Chihuahua or poodle (3)
I believe the answer is:
dog
I believe this clue is a double definition.
'chihuahua' is the first definition.
(I've seen this in another clue)
'poodle' is the second definition.
(thesaurus)
(Other definitions for dog that I've seen before include "Shadow" , "Sort of collar, fight, days" , "Hound" , "Lassie" , "'Every . . . has its day'" .)