Julia Lombard sold the stock of Chinooks to Perry Greene in October, 1940.  Greene moved them to Warren, Maine.  During February, 1941 Perry and his stepson, Johnny Gephart and seven Chinooks hauled 800-pounds of equipment via dog sled from Fort Kent to Kittery, Maine.  They  traveled 502 miles in ninety hours, the longest sled dog trek ever made entirely within the United States at the time.  In 1947 Perry and Johnny Gephart, completed construction of a log lodge, kennel and store in Waldoboro, Maine.  The Chinooks were moved to this location and for the first time were all under one roof.  During 1947 Arthur Walden succumbed to injuries sustained while rescuing his wife Kate from a fire in their home.  Walden was buried next to the Union Chapel on the Chinook Trail.

Perry Greene and his wife Honey promoted the breed for many years.  Unlike Walden the Greene’s did not promote the Chinook as a recreational sled dog but as the “ideal companion dog”.  They created a mystery surrounding the breed and set up many requirements for those wishing to own a Chinook.  If a person wanted a Chinook, he had to stay at the kennels for at least 24 hours.  If Perrys' house dogs didn't care for the person, he went home empty handed.  Should he need to wash his hands after petting the dogs, he didn’t get one either.  To ensure that the Green’s were the sole breeders of Chinook, an unaltered female was never allowed to leave the kennel and no one person could own more than two Chinooks at one time.

Perry Greene died in 1963 and his wife Honey tried to continue their breeding program.  By 1966 the Chinook population was estimated to be sixty dogs.  It was during this time a Chinook named Charger was purchased by the Vetrol Division of Boeing Helicopters.  Boeing produced a helicopter named the Chinook.  Charger was sent to Vietnam as a mascot for an Army Division. Honey died in 1968 and the Greene’s Grandson Peter Richards took over control of the breed.  Due to escalating costs Richards could not keep up the kennels and sold the remaining stock to  Peter Orne of Connecticut.  Orne established the Chinooks at the Sukeforth Kennel (Sukee) in Warren, Maine.  Kathy Adams, a caretaker at Sukee, helped maintain the breed for two years then disbanded the remaining 12 Chinooks to two other families.  Neil and Marra Wollpert of Ohio, and Peter Abrahams of California, and Kathy Adams took over the responsibility for continuing the breed.  They would later establish the Chinook Owners Association (COA) in 1982