I think you'd be amazed at how many people do not know this about their dogs.
ex: I had my booth at a local fundraiser for a rescue organization. One person had rescued a shepard/lab mix who she just did not understand.
She kept telling me that the dog was "interested" in other dogs but when they got close she would bark, lunge, snarl and she had actually bitten one dog.
I witnessed this behavior . What the owner mistook for interest was actually fear. The dog would lean forward sniffing, but her ears were flat back, she was on her toes, her tail was tucked and she had her hair directly behind her neck up. If the dog got too close she would pull forward Barking Barking Barking.
The owner thought that the leaning forward and barking was "hey come here". When it was really "don't make me deal with you.. I'm afraid.. stay away".
Yes, a lot of what I heard from Cesar is definately common sense, but my experience with new/inexperienced dog owners is that they really do anthropomorphi se their dogs, in an attempt to understand them.