Gain access to the Casino electrical closet and restore power to the rest of the Sierra Madre.
Retrieve the Emergency Door key to the Cantina Madrid kitchen.
Access the Cantina Madrid kitchen via the Emergency Door in the Casino.
Confront Dog/God and convince him to back down- one way or another.
Detailed walkthrough
The Emergency key for the electric switch is on a desk in the Cantina Madrid's main lobby. It is sitting on top of a Earnings clipboard, it is where the marker points but it's hard to see.
Head back through the Casino to the steel door on the third level, past the semi-circular bar.
Shutting off all three gas valves isn't incredibly difficult: turn off the one near you as you enter the area, then get the one behind Dog/God's back in the room on your left, then, as he is walking toward the far end of the kitchen, get to the last switch. *Note* you do not have to turn all three off before you talk to him. Turn the one off in the hallway and the one off behind him and then speak to him, after you are done speaking to him you can turn off the third valve.
When you speak to Dog/God, passing speech checks of 50 and 85 can get him to merge his split personality. Doing so will net you positive karma. He'll become somewhat amnesiac from the merger, however he still realizes that he's grateful to you though he doesn't remember for what exactly.
Journal entries
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Bugs
If the key/note is not read in the pipboy before "opening" the security terminal the option for opening the electrical closet door will not apear.
If you enter the room where dog is while your collar is beeping, it will continuously beep throughout that room and their is no way out of it. A way to fix this is to go to a previous save file and reenter the room without your collar beeping.
Notes
All the ingrediants for a caravan lunch are in this area.