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Remains of dogs have been found in sites dating from the Preclassic through the Postclassic periods of Mesoamerica dating as early as 1200 BCE.
As with just about everything to do with the 'Toltecs', whom the Aztecs and other central Mesoamerican cultures of the Postclassic era held up as their valiant precursors whose legacy and authority they inherited, actual and discernible historical data is scant.