My Mom has 20 cats. I wish that was a joke, but it's not. It started with two, then became four, then she adopted a litter of kitties claiming she was running an unofficial rescue, then another one, and then several more kittens. There is a litter box in every room. Breathing normally is not an option in this house, but I suspect there is a bit of the boiled frog effect preventing awareness of this fact. I went to visit and came back with a backpack I cannot remove the scent from.