From Quartz (qz.com):
Put a wolf and a human in a room with a box full of sausage and the wolf will tear into the food, ignoring the person. Try this with a dog and the canine will be torn between two delicious possibilities—gazing at the person or grabbing the treat.
Scientists believe that wild wolves were first attracted to human camps by the prospect of food, as far back as 9,000 years ago in Siberia.Through teaching and breeding, the two species became besties. Now, there’s a genetic clue to how we got so sweet on each other.