There are several rare dog breeds in the world but the rarest dog breed in the world is the Azawakh dog breed.
The Azawakh dog breed is a sighthound livestock guardian breed of dog that comes from West Africa and is also used as a hunting dog.
Other rare dog breeds in the world are the Kooikerhondje, Griffon Nivernais, Norwegian Lundehund, Xoloitzcuintli, Thai Ridgeback and the Estrela Mountain Dog.