a new level of lazy

The other day I tossed the dog onto the bed (not in a violent angry way, she's used to it) and she sort of wiggled, and landed on her shoulder then bounced and turned in the air and ended up landing on her back in the middle of the bed. Form there, she didn't move, she just lied there looking up at me, as if to say "Why both moving? This is comfy enough!" I still can't work out how we ended up with such a slack dog.