2.  Dogs have an innate desire to please.  A vast amount of evidence suggests that dogs, like most functioning animals who want to survive, are motivated by food, water, sex and play.  They enjoy bonded relationships whether in a pack of dogs or humans.  They are motivated by fear and pain, and pleasure.  Most, not all, are social.  Some, like people, prefer to be alone.   

3.  Rewards are bribes and thus compromise leadership. 

Dr. Susan Friedman shares:  the idea that behavior should just "flow like a fountain" without the need of consequences, is opposed by more than sixty years of unequivocal evidence that behavior is a tool to produce consequence.  Bribes are given BEFORE a behavior.  Rewards are given AFTER a behavior.  There is a mountain of evidence after decades of research in pure and applied settings that demonstrates that positive reinforcement (i.e. reward for behavior) is very powerful.