My dog fucking freaks out whenever someone he doesn't know goes through the gate, or into the house. Most people think ohh growling dog, let me stick out my hand so he can smell me... and he bites that shit.
Then maybe 2 minutes later, after sniffing, and me yelling at him to cut the crap - and realizes there is no danger. He becomes fucking annoying putting his head under peoples hands forcing them to pet him, and trying to inch up on there lap.
He is like a 80 lb, huge chocolate lab, with some lose circuits... full fledge doggy bi-polar or schizophrenia.