* Tibetan Dog: This is the most likely ancestor, as the Tibetan Mastiff originated in Tibet and has been bred there for centuries.
* Other Asian Mastiffs: Dogs like the Dogue de Bordeaux, Neapolitan Mastiff, and the Bullmastiff likely contributed to the breed's lineage, possibly through trade routes and migrations.
Important to Note: The Tibetan Mastiff is a purebred breed, not a mix. It's been selectively bred for its specific traits for thousands of years. However, its lineage can be traced back to these ancient mastiff-type dogs.