By Helen Briggs BBC News
17 October 2018
Dogs were part of a key moment in human history - when our ancestors began trying their hand at farming.
As the first farmers moved out of the Middle East, herding animals such as sheep and goats, dogs tagged along too, say scientists.
The DNA evidence fills in some of the gaps in the story of how wolves became the dogs of all shapes and sizes that we know today.
Farming began in what is known as the Fertile Crescent of the Middle East.
This includes parts of modern-day Iraq, Syria, Lebanon, Jordan, Israel and Egypt.
Humans who were living as hunter-gatherers settled down and started growing wild varieties of crops like wheat, barley, peas and lentils.
They also domesticated animals from wild sheep, cows and pigs. About 9,000 years ago, they moved into Europe and Asia, taking their animals and farming know-how with them.
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