Our domestic pets, cats and dogs, have evolved with human beings over thousands of years. Cats have been living in our homes, catching mice, curling up on our laps, and sunning on our windowsills for countless generations. Cats are very intelligent animals and have sensitive feelings which can be affected by both physical and psychological events around them. One of the more subtle reasons why your cat may have decided to use your bed as his or her litter box is that the cat’s feelings have been upset in some way.