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, he will have an increase in attack power.

Location
It can be bought from Old Lady Gibson at Gibson Scrap Yard for 700 caps (free with a Barter check of 70).

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