The Lundehund has a great range of motion in its joints, allowing it to fit into narrow passages. The head can be bent backward along the dog’s own spine, and the forelegs can turn to the side at a 90-degree angle to its body, much like human arms. Its pricked, upright ears can be sealed nearly shut by folding them forward or backward. It has six toes, all fully formed, jointed and muscled. The Lundehund is adapted to climb narrow cliff paths in Norway where it natively would have hunted puffins.