Seymour (Lonesome Road)

 is a dog-shaped rock in the Fallout: New Vegas add-on Lonesome Road, but is only obtainable if you have the Wild Wasteland trait.

Location
In the Cave of the Abaddon.

Behind the Scenes
Seymour is a reference to the Futurama episode "Jurassic Bark" in which the main character, Fry, finds his dog, Seymour, fossilized.