All your cutie has is fear. Maybe I am wrong, but it seems he is not exposed often to meeting new people. I know this because, although my Roxy is very friendly, sometimes, when it is dark and she hears someone approaching, she begins growling and barking until she can clearly sees who approached us. If your cutie does not socializes a lot, I would try making him socialize often, so he can get used to see new people without fear. I hope this helps...
