The purple dog

Any crimes need solving over there?  Nothin' over here yet.

Dog!

Purple!

  These two filthy and lovable beasts hang outside my apartment.  They're the Adventure Gang - they roam the neighborhood and go on adventures, and I'm guessing they solve crimes as well.  A friend trained the small one to get into the elevator with him, ride down on its own, and get off happily on the ground floor.  It works, I've tried it.  They lay out in the sun (hypothetically), and accept lovin' scruffles from all passersby.  Today, the big one had some purple jazz all over it.  Someone thinks it may be anti-flea stuff.  Purple dogs!  It's the Quickening!  The Rapture!
  I feel like water-boarding someone.  No one in particular, anyone will do.  It's raining.