My husky is afraid of doorways

Question
I just got a Siberian Husky off a friend of my moms,I think he might be part malalmute too. He is about four years old. I don't think he was very well taken care of previously, He doesn't play with toys, balls, frisbees, nothing. Could it be just because he has never had them?

What I'm more worried about is his fear of houses, it's almost impossible to get him even near a doorway, he gets very scared and will do anything he can to not go inside, and its all buildings, he wouldnt come into a pet store with me either. With much force we can get him inside, and once inside he seems way less scared, what could be causing this?

Also, i know this is probably a stupid question but he has severe chest congestion that we got antiobotics from the vet for. but can humans catch things from dogs? if its some kind of virus?

Answer
First, it's not surprising if your Sibe doesn't play much with toys, balls, etc.  A lot of Sibes really could care less about such things, as most prefer just to run, chase small animals, and eat tasty tidbits.  So, some dogs just never like them.  Not a big deal, but feel free to try some things to see if maybe it is because he just hasn't had them around.  However, don't expect him to fetch, it's a rare Siberian that actually will.

Fear of houses . . .

Actually, I bet this isn't a fear of houses, but a respect of thresholds.  It's a quirk of canine behavior, but there is a social hierarchy that can manifest itself in who gets to cross a threshold first.  Violate that, and the dog can become very confused and agitated.  Most canines don't hold to it, but I've seen plenty that do (enough that I would just term it "uncommon").  It's impossible to say from your description what your dog is doing, but it sounds pretty typical.  I would try some treats to help it along, entering or not entering first (depending on what seems to be causing the trouble) and working on a lot of obedience work (usually helps overcome hierarchical concerns).

Finally, yes, humans and canines alike can get sick from each other.  It can be viral or bacterial, although there aren't many illnesses that transfer from one to the other with the same potency.  Since the immune systems are different, things that cause a dog severe problems might be a runny nose for a human, and vice-versa.