Dogs of these breeds you are unlikely to meet on the street. They either stopped breeding, or the breed practically died out due to some kind of cataclysm, or these animals are so exotic and difficult to keep that not every owner can handle them.

Chinook
This is one of the rarest dog breeds on the planet. And these dogs look more like mongrel dogs than representatives of an exotic breed. In fact, a lot of work has been invested in the breeding of this breed in order to consolidate its characteristic, stable features, as well as many different “bloods”. In order for the Chinook to be born, dogs were selected from St. Bernards, Mastiffs, Eskimo Spitz, Huskies, Great Danes, as well as large mestizos and mongrels.
The American cynologist Arthur Walden (New Hampshire) took up the selection of the breed at the beginning of the 20th century. The creator of the new breed was haunted by the excellent working properties of the Siberian Husky, he tried to create an American analogue. Therefore, the Chinook turned out to be just as fast, powerful, hardy, able to work in a team and well adapted to harsh climatic conditions.
The American breeder had a favorite dog Chinook, after whom Arthur named the new breed. This dog participated in dog sled races and became their record holder more than once. In 1927, Chinook became the leader of a dog team that took part in a polar expedition led by General Byrd. Chinooks are not only good sled dogs, they also have excellent security qualities, and, of course, you can be friends with them - they are great companions.
Abyssinian Sand Terrier
One of the rarest breeds. There are no more than 400 dogs of this breed worldwide. This is also one of the most mysterious breeds, because almost nothing is known about the history of its origin. Only its place of origin is known - Africa.
The Abyssinian Sand Terrier, like dogs of other "naked" breeds, are considered sacred by African tribes. It is very difficult to find a representative of this breed in free sale in Russia, except perhaps on the "black market".
Sand terriers are not suitable for inexperienced owners, these dogs are very difficult to train because of their stubborn nature, they do not remember commands, and do not like when someone tries to "lead" them. But the Abyssinians have highly developed guarding instincts.
Leonberger
These dogs, with a black "mask" on the muzzle, cannot be confused with anyone. They were bred in the south-west of Germany in the 30-40s of the 19th century, and the mayor of Leonberg, Heinrich Essig, took up this business. In the breeder's dreams, the breed was supposed to look like a mountain lion, which was the heraldic symbol of the city.
The dog had to be very large, so the Newfoundland, St. Bernard and Pyrenean mountain dog took part in its genes. The Leonbergers turned out to be large, massive, calm and good-natured.
Essig made such a loud advertisement for his pets that dogs of this breed quickly became very expensive, and in general, they were most often given as gifts to aristocrats and kings. After the Second World War, the breed fell into decline, leaving only eight purebred Leonbergers. In our time, the breed has been restored, but remains one of the rarest in the world.
Pungsan
A rare breed of dog bred in North Korea. Evidence of the appearance of dogs of this breed dates from Korean sources as early as the 14th century. There is a lot of controversy about the origin of this breed, the most common version is that the punsan appeared from crossing native Korean dogs with wolves. Smart, strong, he althy and devoted to man “white wolves” turned out. Pungsan is the pride of North Korea, it is a dog breed that has the status of a national treasure. But outside of this country, dogs of this breed are almost impossible to find, in addition, it was not recognized by international cynological organizations.
Sapsari
Another "Korean", only this time the breed can be found not only in North, but also in South Korea. Sapsari is the oldest breed of dog, the mention of it dates back to 935 BC. Koreans have a special relationship with this breed, its name is translated as "pulling out evil spirits." It was believed that these dogs have the ability of "ghost hunters", that they are able to protect the house and its inhabitants from ghosts and evil spirits. However, living unkind "guests", sapsari will also be well escorted out of the house.
Unfortunately, during the Second World War, a lot of dogs of this breed died, only a small group of sapsari survived. After the war, disputes began among cynologists about the purebred of the breed. Some of the experts believe that the ancient sapsari were completely destroyed, and the modern representatives of this dog breed are the result of its restoration.