The Chinook Breed was developed by Polar Explorer Arthur Treadwell Walden during the early 1900's on his farm in Wanalancet New Hampshire. Walden's farm was located along the same quiet country road, "The Chinook Trail", where Milton and Eva Seeley helped develop the AKC Siberian and Malamute breeds. By blending a Mastiff type dog with Greenland Husky, German and Belgian Shepherds, Walden succeeded in creating an American breed of sled dog with power, endurance, and trainability, with a friendly, gentle nature, and with a distinctive tawny color.
In the following years, the numbers of the breed he created dwindled to the point of near extinction. In 1965, Guinness World Records listed the Chinook as the rarest dog breed, with only 125 known specimens. That number dipped even lower before dedicated Chinook enthusiasts around the world slowly brought the breed back from the brink. Their hard work paid off in 2013, when the Chinook joined theAKC Working Group. The Chinook is the official state dog of New Hampshire.