Through selective breeding we have chosen traits to form a companion animal that is amiable to our wishes, cooperative with humans and physically diverse. During that same time, wolves have developed fast reflexes and incredible jaw strength. This comes in handy during hunting. Speed helps to avoid injury and allows a low ranking animal to quickly steal tidbits from the kill. Jaw strength enables the wolf to rip through the hide and to shatter the bones of the prey for the precious marrow.
Wolves serve to balance the environment and to cull out the sick and weak prey animals.
They live in tight family groups called packs. Each has their role with a complex hierarchical system. Complex communication and communal care is contrasted with squabbles within the ranks and fights to rise in the hierarchy. Dogs, on the other hand, have been molded to stay in a cooperative and dependent state. They are adapted to accept human leadership and it is not essential for them to challenge that leadership or to change it.