I often hear that many dogs have a "desire to please their masters." I also hear that there is no such thing as a desire to please without selfish motives on the dog's part (i.e. the dog wil get treats, affection, positive attention, etc. for doing things that are pleasing to its owner) What do you all think about this? Can dogs really have a "desire to please" just because they want their humans to be happy, or are there always selfish motives involved?