Early socialization will keep its tendency to chase small animals and confront other dogs under control, although this behavior is not as big of a problem with the Tunnel Terrier as it is with most other working terrier breeds. The chest is deep and the backline is straight. Natural "bat" ears are prefered, but can be cropped for work.
The coat is short, thick and flat, accepted in all colours, except uniform black or blue. Average height is around 15 inches.