There's a new multi-part English documentary about the secret lives of dogs? Sign me up right now. That ticks so many boxes for me. 
I wish my dogs watched tv
Also I have always wanted to put a nanny cam in to see what they do when I am not home, does it get all Lord of the flies up in heree
I like to imagine that dogs are far smarter than we give them credit for, and when we're not watching them they do things like solve differential equations.
The reality is probably far closer to what you're suggesting though. It's likely just nap > lord of the flies time > nap > repeat.