Are dog-owners in Norway ready for my doggy-cupcakes?

NO it sounds st* !!!!

I think it depends on where you are in Norway. If you live in a place with too much freakin' money, like Stavanger or Ulsteinvik or another oil-loving place, they will probably go for it. However, otherwise, Norwegians seem like pretty practical people....

Most if not all dog owners I know in Norway use their dogs for hunting. I think they would rather they chewed on a dead bird rather then human food dressed up for dogs.

I don't want to put your idea down but I would be very careful with this how much you spend on developing your product for Norway.

I think there exists a market for it, but it really depends on where in the country you are. In some of the bigger cities there might be a good market for it.
But it is true that norwegians are practical people, things that are more for looking at might not get as popular as something more practical. Atleast among the average dog owners. Tasty and healthy rather than pretty to look at.
I assume this product is produced with good conciousness of the dogs health too? That would atleast be a main priority to me if i had a dog, that the snacks would have to be healthy too.