A Brain's Best Friend

A Brain's Best Friend is a side quest in the Fallout: New Vegas add-on Old World Blues.

Quick walkthrough

 * 1) Try to find any trace of Gabe in Higgs Village.
 * 2) Find Gabe's bowl behind one of the houses
 * 3) Return to Dr. Borous

Behind the scenes
The quest name is a probable nod to the saying that "dog is man's best friend".