Interesting thread - It would have been nice if there had been more effort to preserve the indigenous dogs of the Americas, so perhaps some ideas in this thread could be based on them. Dogs travelled across the landbridge from Asia along with the Native Americans, but despite a history spanning back many thousands of years, it seems few of them survived into modern times, especially in the United States. A
recent study shows that rural dogs in the Andes and Mesoamerica, much like people who live there, still have a lot of indigenous ancestry, but in North America, most stray dogs are descended from ancestors introduced from Eurasia. Indigenous dog DNA north of Mexico is limited to Arctic sled dogs and a few peculiar, isolated populations like the Carolina dogs.