Isn't overcrowding an issue as well? I guess that would imply dirtiness....IDK, not a cat person. However...I work with one lady, who is older and a small fat. I kid you not......this woman has 20 some cats. I had the great misfortune of being stuck behind her on the exterior stairs entering the office one day. Holy shit, did she reek of cat pee. It was terrible, and we were outside! Luckily, I could hold my breath long enough to get into the building.