I have two cats. One is an inside cat and the other is both, inside and out. My ...
according to dr. robyn dvm:
often, medical conditions causing inappropriate elimination can be mistaken for behavioral problems. it is important to make sure that you cat does not have any underlying medical conditions that may be causing this behavior, so be sure to have your cat checked by a vet for any problems. many vets will also be able to give you advice about how to control behavioral related issues should it be determined to be behavioral in nature.
once a pet begins eliminating in inappropriate areas, it is important to make sure you clean the area with an appropriate enzymatic cleaner. this will help eliminate the odor that your cat smells, which in turn prompts her to relieve herself. try to wake up before your cat does and get her to her litter box. then praise her for relieving herself in the right place.
ensure that the litter box is cleaned on a regular basis. many cats are very finicky about their litter boxes and require it to be scooped or cleaned daily. a litter box that is not clean will certainly prompt a cat to eliminate elsewhere! it is also important that you do not change location of the box, litter types, or box types as many cats do not like change. if anything about the litter box has been changed recently, you may want to change back. some cats may not want to share litter boxes either, so it is important to make sure that you have plenty of boxes. as a general rule of thumb, you should have one more box than you have cats.