Greenland

One of the most ancient and rare breeds of dog in North America, the Greenland is a nearly timeless figure with an endless drive to work and play. Outside of Greenland itself, it's quite rare to find this breed, as their isolation, heavy coats, and unfaltering temperament hardly make them suitable for living outside an environment of this type. They sport an exceptionally thick double coat that allows them to survive in arctic temperatures comfortably (as low as -75° F) and even their furry pricked ears, the most exposed part of their body, rarely sees any signs of frostbite. Although they are quite affectionate and generally good with people, they require an experienced and consistently authoritative owner to keep them in check, often even after going through extensive training. They are easily one of the highest energy dogs around as they were bred to be working dogs since their origin and have a constant drive to work. Because of it, they have incredible stamina, which, paired with their powerful build, makes them perfect sled dogs. Historically, they've also been used to hunt polar bears and seals, as their nose and hunting instincts are well-established and their mental and physical toughness is nearly unrivaled. So while they may boast excellent working and some well-rounded personality traits, they rarely, if ever, do well in a home that is too small, does not provide the extensive exercise they need, or without a true alpha to command them.