During domestication, dogs most probably have been selected for increased tractability. If so, then considerable differences should be found between domestic dogs and their closest wild relatives, wolves, in this trait. To reveal if such a difference exists, researchers at the Family Dog Project, Eötvös Loránd University assessed the development of tractability in hand-raised wolves and similarly raised, 3-24-week-old dogs. They found that despite intensive socialization, wolves remained less tractable than dogs.
