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People may have domesticated canids that left no genetic trace in later dog lineages (including the American dog lineage). Alternatively, some wild canids may have been kept as pets and others hunted; some may have been fed salmon and others terrestrial resources, a dietary diversity seen in domesticated dogs a few millennia later. Yet in another scenario, salmon-feeding to canids (wild or domestic) started in the Younger Dryas but only became common during the Early Holocene.