Episode 1:- How do you Baricade Door? [spoiler]

[Yuhaney]

Just block the door and run straight to the TNT barrel and continue game, the dog won't bother you.
It's scripted to break the door and walk certain, and also, very small area over and over again. It doesn't know you're there (unless it hears or sees you, but from that far away, it doesn't know anything).

The game is possible to be played without killing a single dog (that's what I did).