Don't worry, I'm not saying it's always the same. Theres a different situation for each dirty house.
There could be a lot of story that we don't know. This person could have severe depression problems, and probably a mental disorder. That doesn't make them crazy, just unstable.. (I consider crazy more maniac psycho murderer type).
I know it! I was thinking about that poor cat too. Luckily it was probably able to hide in a softer area (as some of it seems to be clothes and drapes) for most of the time.
The difference with this house, is the main living area is filled with non-wet garbage (despite things in cups/containers/cat waste). Most of it seems to be stuff that you could step on and not step in a sludge of some sort.. except for the bathroom.
Blech.