EDIT: Says in the picture (bottom-left corner) but just for the sake of respect to the artist - FYI: THIS IS NOT MY WORK.
It can be seen @ http://johnjoseco.deviantart.com/art...sion-209619888 by JohnJoseco
There's a Fallout Anthro (heh) group on DeviantART as well: http://anthrofallout.deviantart.com/ - Most of them are Eh except these http://anthrofallout.deviantart.com/gallery/32257921#
EDIT2: Oh wow, there's 612 pieces on DeviantART that meet the search "fallout pony" http://browse.deviantart.com/?qh=&se...q=fallout+pony
(Click below for the picture)