*EDIT: I had a lot of info posted here about Japanese wolves, but I'm going to try and rewrite it in a preferably shorter and more coherent manner, as well as gather and quote my sources more accordingly. It should also help with the keywords as this picture seemingly pops up everywhere because of the previous text wall.
Photograph of one out of two extinct Japanese wolf subspecies. This one if of canis lupus Hodophylax.
It's one of the two only specimens in Europe. There are five more in Japan. This picture is of the one located in Leiden, The Netherlands. The other one's located in London.
It was on display for a temporary exhibition where the most important pieces of the Siebold collection were shown (Siebold is the guy who collected the specimen).
I'm putting this picture up as stock in case anyone would like to use it for educational purposes. Please do give credit somewhere if you decide to use it or just link back to it somewhere.
Oh, I've heard of that breed. I think it's more commonly called the Hokkaido-Ken. There are other Japanese dog breeds which are thought to have some Japanese wolf ancestry due to their purity throughout the centuries, like the Shikoku-Ken and several breeds of Shiba. (These native breeds didn't originate from Japanese wolves; they were first domesticated on the mainland and brought over some 9500 to 8000 years ago.)
From what I understand, it's uncertain just how much Japanese wolf ancestry these breeds have. There's a lot of dispute about the differences between Japanese wolves and native dogs and about the degree they once possibly hybridized.
There are rumors (and alledged pictures) of them still being alive somewhere, but none of them have been officially confirmed so far. If they did survive, knowing they were on the brink of extinction they would've hybridized rather heavily with domesticated dogs by now. Hybridization with all kinds of dog breeds (including European ones and other breeds brought from the mainland) was already a factor which might've sped up their initial extinction by the time they were almost completely gone; many simply got "absorbed" into the dog gene pool. If this was already happening over a century ago while their habitat only shrunk in the meantime and domesticated dog populations increased, it's hard to imagine any 'pure' wolves still being out there.
Bringing them back to life wouldn't be an option in this case. You're probably thinking about cloning extinct animals back to life like they're trying with the Thylacine, but so far simply getting any good enough DNA material to analyze was already remarkably difficult and only partially possible.
The Hokkaido dog's name is pretty recent though.
They are trying to recreate the Jomon Shiba, which is thought to have been the ancestor of many Japanese dog breeds. It shared a few traits with Japanese wolves which they are trying to recreate. Genetically they won't be the same, but they'll look alike.