The lundehund is a very old breed, and it comes from Norway, which you maybe already figured out from its name. The lunde part of the name is from the Norwegian word lundefugl, which means "puffin." So the lundehund is called a "puffin dog" because they were used for hunting puffins.
Anyway, the baby puffins haven't learned to fly yet, so the adult puffins push them -- or "puff" them -- off the edge of the mountain cliffs, which is kind of mean of them, if you ask me. And some of the baby puffins figure out how to fly, but others just kind of go splat on the rocks. And this is where the lundehunds come in, because they can climb up there and retrieve the dead puffins and maybe some live ones, too, and bring them back down to their humans.
Another thing that makes lundehunds good puffin dogs is that their joints move in all sorts of weird directions. For example, lundehunds can bend their heads back really far without even breaking their necks, and they can also stick their front legs straight out to the side, like people can do with their arms. And another thing they can do is close up their ears to keep out water and dirt and any commands that they don't want to obey.
So all of these special skills make lundehunds able to climb up the cliffs and squeeze themselves into very small spaces where the puffins are. And after they get in there, they can usually get back out again, which is also important.
Mostly the people in Måstad and other villages on the coast made their living by fishing and farming, but they also relied on puffins, especially in years when the fishing and farming weren't very good. And what they did with the puffins was they salted them and put them in barrels, and then during the winter they ate them, like in soup or whatever. Also they used the down from the puffin, because it was soft and nice, like eider down. And they could sell the down and make money that way.
These dogs have lots of energy, so they need lots of exercise or else they will get bored and get into trouble. They also bark a lot, and this is how they protect their home and their people. They like digging, playing with toys, and carrying things around in their mouths.
So anyway, that's some basic information about lundehunds, and if you want to see one, there might be one at a dog show near you, or you can watch the Westminster show on TV.