Final answer:
The earliest fossil evidence of domestic dogs comes from Hinds Cave, Texas, with remains dating to 9260 years before present, indicative of the significant role dogs have played in human civilization.
Step-by-step explanation:
The earliest fossil evidence of the domestic dog is believed to be from Hinds Cave, Texas, where domesticated dog remains were identified in human coprolites dating to 9260 BP. Domestic dogs, Canis lupus familiaris, are thought to have originated from wolves, and their domestication marks a significant point in human history. Through the process of selective breeding, various wolf subspecies contributed to the genetic diversity of today's dogs, which have been historically significant across different cultures for their roles in activities like hunting, herding, and as a source of food.