New Delhi, March 27 -- Using the oldest dog genes studied so far, scientists are finding more evidence that our furry friends have been our companions for thousands of years.

Scientists think dogs descended from an ancient population of gray wolves somewhere in Europe or Asia. Tens of thousands of years ago, those wolves got used to living with people and became less aggressive. As they became domesticated, their genes shifted along with their behavior, giving rise to the pups we know today.

But exactly when and where this happened remains a mystery. Scientists are studying bits of DNA found in ancient dog and wolf remains to figure out what the earliest dogs may have looked like and where they came from.

In two separate studies publis...