Fallout New Vegas: Dead Money DLC unlocks another area in Mojave Wasteland; Sierra Madre. You will visit Sierra Madre in the wake of grand opening of a casino and end up in a quest for survival. You can watch the videos below if you need assistance in completing the story.
Fallout New Vegas: Dead Money – Intro
You will discover Camp Forlorn Hope in the intro to Dead Money.
Fallout New Vegas: Dead Money – Dog
You need to find the Dog at the police station in Villa.