They are all so high... And Shaggy is way too clean shaven.

Post-Apocalyptic Scooby Gang:

I'm guessing they ate the dog?  b/c you know..... starvation and such?

Sure does look like it. Shaggy looks like Daryl Dixon from The Walking Dead.

Scooby Doo, where are you?

http://pandawhale.com/post/11145/scooby-doo-gif

Zoiks!

Velma Cosplay: http://pandawhale.com/post/12260/scooby-doos-velma-cosplay