"The Cat Who...." books by Lillian Jackson Braun are great fun as well. They are fiction and I am reading one of those right now too. This is non-fiction.

If I were starting the LJB series...you could pick any of them up and enjoy but there is a starting point when the main human character is in Chicago and acquires the cats. Eventually he moves to a rural area. And don't worry Randi...none of them are sad!