[GusGus]

So, as you know, Gus is a year and a half about. I would like some input on his behavior, cause after reading about all the different types of things it could be, I'd like to share more info to get an answer to what this could potentially be or become.

People:
When we walk during the day he is fine walking right past people, although he will intently stare at them. no barking or growling. Just the stare down..

At night when he's on a leash or in the car and someone is passing by walks too close to the car he gets a very deep growl and barks/almost howls. Hackles down.

Dogs:
Doesn't matter if it's during the day, at night, in the car, house, leashed whatever. His hackles are up, he uses a very deep growl, and a deep bark, jumping around and going crazy. and if the dog starts to walk away he whines and paces in a trot almost. I've tried putting him on leash and letting him walk up to another dog when he is doing this (don't know if that's bad for him or not. I just really needed to see what he would do. and I had him under control) He walked up sketchily and sniffed for a bit ears erect but turned back, hackles still up. Then he kept putting his paw on the dogs shoulder.

What is this and how do I help him? Could this turn into something potentially really bad? How will it affect his life?

Thanks! I'd really like to do all I can to get him help.