The Lundehund breed of dog has 6 toes on each foot, including two dewclaws, can close its ears, and has joints in the nape of its neck, which other dogs do not have, which means it can turn its head at 180 degree angle.
The Norwegian Lundehund's Physical Characteristics
Here are some of the characteristics of the Norwegian Lundehund breed as determined by the Norwegian Lundehund Association of America's published breed standard.
Size: male 14 - 15 1/2 inches, females 12 3/4 inches - 14 inches
Coat: undercoat: dense, rough, soft; short on head and front of legs; abundant at neck, thighs, and on the tail.
Color: combined with white: red to fawn; black, grey, and white with dark patches
Eyes: sloping, yellowish-brown
Ears: triangular, mid-size, broad-based
Muzzle: wedge-shaped, mid-length, nasal bridge is slightly convex
Tail: set high, mid-length, well covered with hair