Some people who have studied the behavior of wolfs and dogs have reached some conclusions that show great similarity between these two animals behavior.
1. Why dog hides his food (bread, bone, etc.)?
It is an instinctive behavior: wolves hunt large animals and therefore can not consume all their prey; They use to bury or hide the rest to preserve it for later.
Our dogs, even if there is no need to hide the food because they have in abundance, do the same thing instinctively!