Ya know fuefo, I used to have a Shih Tzu that I kept inside and let lay on my furniture, but he was kept very clean, and of course trained to go out.
But recently I went to someone else's house and they had big dogs in their very nice home, and the smell about knocked me out when they opened the door and I went in.
So, moral of the story is, that smell & experience has either changed my perspective of the subject of animals being kept inside, or that big dogs should not be kept inside as small dogs are.
I'm still undecided...