They are the smallest of the working terriers. They are active and compact, free moving, with good substance and bone. Good substance means good spring of rib and bone that matches the body such that the dog can be a very agile ratter or earth-dog.
Generally, Norfolks are not given to digging but, like any dog, will dig out of boredom when left alone for too long a period. Norfolks are not yappers and are not particularly vocal; however, they will bark when appropriate given their watch-dog tendencies. They generally cohabit well with other household pets when introduced as a puppy. Outdoors, they are natural hunters with a strong prey drive for small vermin.