I guess what I mean is there are two parts to the human-dog bond. The dog's feelings to the human, and the human's feelings to the dog. I'm not sure which part the OP is concerned about.
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It's possible that the dog will come to your defense if he or she detects that someone is being aggressive towards you, but I doubt that manipulativeness and mind games are something a dog would pick up on.
You'd be surprised what dogs pick up.
This one reporter who was friends with Ted Bundy, before he was caught as a serial killer, says the only one she knew who didn't like him was her dog. Everyone else found him charming and friendly, but her dog was freaked out by him.
I think it's several things:
a) dogs have a better sense of smell, which can tell them how you're feeling as well as what activities you like to do
b) dogs are genetically selected for good people-reading skills (a lot of research has tested dogs on social perceptual/cognitive tests with humans - dogs are even better at reading humans than chimpanzees are, and
far better than tame wolves matched for socialization experience)
c) people are less deceptive with dogs (many manipulative people will show their 'true side' when interacting with someone who can't fight back or tell anyone - for example my grandma had a neighbor who she caught kicking her dog when she wasn't looking, and suddenly knew why the dog hated him)