Foremost the entire DLC is a nightmare. I can't even get to all three gas valves before that damn DOG blows us all up, the Son,...of...a...b...! And I am damn sure I am not doing it over again.

You gotta sneak. Take note of the route he walks.

When I entered the door to my left after shutting off the first valve Dog was standing in the doorway leading to the three valve. I couldn't go around him -- unless I went back out the door I came in and enter the room with the third valve from the other direction. It blows that damn quick.

He walks around. Wait for him to move and stay behind cover.

I finally got it and Christine too. Now I am after Dean. Another nightmare. I have to say that I am extremely tired of those speakers, radios and that god forsaken beeping. I don't know how mush longer I can stand it. It is literally making me livid. I just want to finish this DLC and I will never go back, ever.