Looking for a fic (pretty sure it's also a podfic) where Sam and Dean are the only people left on earth. Everyone else just seems to have disappeared like in the Left Behind senario.

Things I remember:
-Sam sees a puppy (lab?) and even if he wants to bring it with him Dean convinces him that the dog will be better of with the other "wild" dogs roaming around. They drive away.
-They end up at a farmhouse. They find a small dead dog in a corner. Dean cleans up the mess so Sam doesn't have to.
-One night, while they are traveling, they end up somewhere and Dean is forced to turn on the music to keep from hearing all the dogs trapped in houses and apartments howling.
-Also almost certain it's a Sam/Dean fic. I don't normally read that but in this case it actually seemed logical for them to end up together.
-Don't think Castiel was in it. Just Dean and Sam.

Almost 100% sure I heard this as a podfic but have't had much luck looking for it at Audiofic.

!Found!
Link to fic: http://gekizetsu.net/sn/lastoutpost.htm
Link to podfic: http://www.audiofic.jinjurly.com/last-outpost-of-all-that-is