Their pricked, upright ears can be folded shut to form a near-tight seal by folding forward or backward.

The Norwegian Lundehund is a polydactyl: instead of the normal four toes per foot, the Lundehund normally has six toes, all fully formed, jointed and muscled.

They are able to bend their head backwards along their own spine and turn their forelegs to the side at a 90-degree horizontal angle to their body, much like human arms. 

The Lundehund has a great range of motion in its joints, allowing it to fit into and extricate itself from narrow passages.