Since the time of Charles Darwin, scientists have argued over the origin of domesticated dogs.
The dogs changed from wolves. Our ancestors in the Middle East took wolves as pets.
The dogs were raised as a source of meat in early agricultural societies in Asia.
After comparing the DNA, the scientists find out that the dogs evolved from a now extinct species of European wolf, which followed bands of humans who were hunting woolly mammoths and other large prey.
Peter Savolainen， who is an associate professor of evolutionary genetics.He said there was plenty of evidence that dogs were first domesticated in China, probably as a source of food.
We view them as members of our families and we want to know where they came from and how this relationship came about.