Animal Network Forums: Litter Box Concerns - Discussion group on house training cats.

Aston Woods Pixie-Bob: Pet Soiling - Addresses inappropriate soiling medical issues the cause of the problem spraying and what not to do.

Cat World: Terrified by Tom - How to stop a female cat spraying in the house.

Douglas Island Veterinary Service: Toilet Training Cats - Teach your cats to sit on the edge of the toilet and do their thing. Saves lots of money.

Dragon's Lair: Litter Box Training - How to teach your kitten to use the litter box.

Escape the Planet Urine - Information about litterboxes placement training behavioral problems and cleaning. Produced by a company selling a pet product.

How to Toilet Train Your Cat - Step by step guide to how to train your pet to use a human toilet.

Purina: Litter Box Basics - Tips to keep your cat satisfied with its litter box. Choosing and placing the litter box filler information litter box cleaning and disposing of litter.

Purina: Spraying - Explanation of reasons for spraying with treatment suggestions and possible related health problems.

Spraying and Marking: Understanding Spraying and Marking Behavior - Covers of inappropriate elimination behavior in cats.

VetCentric: The Big Stink About Cat Pee - How to eradicate the scent of cat urine.

Wendy Blount DVM: Urine Marking - Article about spraying by Dr. Wendy Blount.