When did dogs branch off from wolves, and what is the Latin name for domestic dogs?

• A. 80,000 - 130,000 years ago; Canis lupus familiaris
• B. 10,000 - 20,000 years ago; Canis familiaris
• C. 200,000 - 300,000 years ago; Canis lupus arctos
• D. 5,000 - 9,000 years ago; Canis lupus baileyi

Answer: (A)

Divergence timing and taxonomic naming. Dogs are domesticated from gray wolves, and scientists estimate that the wolf-dog lineage split occurred tens of thousands to over a hundred thousand years ago. The option reflects one older view that the split happened roughly 80,000 to 130,000 years ago, which fits with many genetic and fossil interpretations that place deep ancestral roots for the domestic dog. The Latin name Canis lupus familiaris shows that the domestic dog is classified as a subspecies of the gray wolf (Canis lupus), acknowledging its close genetic relationship to wolves while recognizing its domesticated status. Some sources use Canis familiaris as a separate species, but Canis lupus familiaris is a widely accepted taxonomic form in veterinary and zoological references, which is why this naming is used here.