Find Collar 8: "Dog"

 is a Fallout: New Vegas Quest within the Dead Money DLC.

Objectives

 * Find Dog at the Police Station in the Villa and recruit him.

Overview
This quest is given to you by Father Elijah after completing the quest Sierra Madre Grand Opening!. He instructs you to recruit three companions in order to perform a heist against the Sierra Madre casino.

Detailed Walkthrough
Head to the police station in the south-west of the Sierra Madre resort.

Enter the police station and destroy the radios on the desks directly in front of you, next to the door on your left and under the desk next to Dog's cage. Continue through the doors and destroy the radio on the desk just around the corner.

Head down into the police station basement where you will be greeted by the voice of God, there is a speaker in the tunnel just ahead, destroy it by tossing a frag grenade, which can be found upstairs in the toilet cistern next to Dean's secret stash.

Continue through the basement until you reach a desk with a broken radio on it, God will instruct you to pick up the holotape on the desk and informs you what to do with it.

Head back upstairs and play the holotape in front of Dog's cell, this will bring out God from his 'cell' and he will start a conversation with the player. During the conversation the player will have a choice whether to convince God to come along as he is, or to play the recording of Father Elijah in order to force Dog back out again, who will follow along willingly. This choice determines who the companion will be and which related perk you will gain.

Regardless of the player's choice as soon as the cell is unlocked the quest completes.