I cannot create a summary of the requested article because the search results provided do not include the article "World's oldest dog identified at ancient hunter-gatherer site" from Science, Volume 391, Number 6792, March 2026. The search results contain information on another topic - the oldest known dog in the history of living animals (Portuguese Bobi dog) and paleontological findings of ancient dogs from Siberia and Belgium 33,000 to 36,000 years old. However, these articles are not identical to the article you listed. In order to create an accurate and factual summary of the requested article, I need access to its full text.