Happened to come across this and it's exactly what we have needed.  Much better than constantly straightening a blanket!!  (dog bed is also a Wayfair purchase I happened upon!).  Our sofa seat is 64 inches from arm to arm and this fits fine!  Nice and snug.  Seems like it will stay in place.  Light and seems like it's easy to wash.  Saw some negative reviews about the thickness.   Definitely not thick like a blanket...more like a plush fitted sheet.  Works for me.  Mostly trying to keep fur and slobber off the leather!! Color I got was Coffee.