Small breed of dog (7)
(Other definitions for terrier that I've seen before include "One who volunteers to fight" , "Dog originally used to ferret out burrowing animals" , "part-timer in Services" , "Small lively dog, may be Scotch" , "Dog - army volunteer - land register" .)
(Other definitions for pug that I've seen before include "This nose is like a boxer's" , "Dog with broad flat nose, or short fighter" , "Dog with broad flat nose, or an informal boxer" , "Dwarf breed of bulldog" , "Small compact dog" .)