RENEE MONTAGNE, HOST:
It took a very long time for this...
(SOUNDBITE OF WOLF HOWLING)
MONTAGNE: ...to evolve into this:
(SOUNDBITE OF DOG BARKING)
MONTAGNE: But the gray wolf is the ancestor of all domesticated dogs, including that Jack Russell terrier we just heard. Just how wolves came to live with people isn't really known. But as NPR's Veronique LaCapra reports, a new study suggests that food may have played a role.
VERONIQUE LACAPRA, BYLINE: Most dogs will eat just about anything.
(SOUNDBITE OF DOG EATING)