Here in Jordbro this little 8 months old dog payed a visit. It is a Norwegian Lundehund, a very special dog. From Wikipedia:
The Norwegian Lundehund is a small, rectangular Spitz type dog. The Lundehund has a great range of motion in its joints, allowing it to fit into narrow passages. The head can be bent backwards 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.The Norwegian Lundehund is polydactyl: instead of the normal four toes a foot, the Lundehund has six toes, all fully formed, jointed and muscled. The outercoat is dense and rough with a soft undercoat. The Lundehund is adapted to climb narrow cliff paths in Røst in Norway where it natively would have hunted puffins (lunnefåglar) .