Put the Beast Down

 is a quest in the quest in the add-on Dead Money.

Quick walkthrough

 * 1) Gain access to the Casino electrical closet and restore power to the rest of the Sierra Madre.
 * 2) Retrieve the Emergency Door key to the Cantina Madrid kitchen.
 * 3) Access the Cantina Madrid kitchen via the Emergency Door in the Casino.
 * 4) Confront Dog/God and convince him to back down- one way or another.