Rey's Brain

Rey's brain is a miscellaneous item in Fallout: New Vegas.

Characteristics
It is one of three possible replacement brains for Rex in the quest Nothin' but a Hound Dog. If it is used as a brain for Rex, then he will have an increase in attack power.

Other dropped dog brains are Violetta's brain and Lupa's brain.

Location
It can be bought from Old Lady Gibson at Gibson Scrap Yard for 700 caps, less with a skill check (free with a speech check regarding immortality), during the quest, Nothin' But a Hound Dog.

This item can also be gained by simply killing Old Lady Gibson's dog Rey yourself and taking it off of his body.