New research at indigenous Alaskan archaeological sites dates the origins of human-canid friendship in the Americas to 12,000 years ago, 2,000 years earlier than previous evidence.
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Keep in mind that NA was pretty much scowered, burned off by the Event 10900 BC that killed of the mega fauna, eliminated the Clovis people, ushered in the Younger Dryas Event which lasted 1000 years, and caused sea level to rise 400 feet.
What happened prior to that Event is spotty at best. So canines could have been pets long before that 12,000 date.
My guess is 30,000 - 50,000 years..............