I know a guy who used to install sound systems for home entertainment centers; surround sound for the TV.  One time he got called to a large house in Waianae (it was the owners residence for a large dairy), and the maid showed him to a room that had a big TV and five bean bag chairs in it but no other furniture.  He thought that was a little odd, but this was the 70's and bean bag chairs were popular.  When he was finished, the maid rang a little bell and five big dogs came running and each dog curled up in a bean bag while the maid turned on the TV.  The room was the dog room, and the sound system was just for them.