Scottie or Yorkie (7)
I believe the answer is:
'scottie or yorkie' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for terrier that I've seen before include "Small, originally burrowing, dog" , "Small lively dog, may be Scotch" , "Dog bred for hunting" , "Dog originally used to ferret out burrowing animals" , "Breed of dog - volunteer soldier - estate register" .)