Small terrier
(Other definitions for lhasa apso that I've seen before include "Tibetan breed of dog - a salsa hop (anag)" , "Shown [AT CRUFTS]" , "small dog" .)
'small terrier' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for yorkie that I've seen before include "Mini-terrier" , "Terrier breed (colloq.)" , "Long-haired dog" , "Small terrier" , "Barker" .)
(Other definitions for scottie that I've seen before include "Breed of terrier" , "Dog" , "Type of terrier" , "animal" .)