Wendy Blount DVM: Urine Marking
- Article about spraying by Dr. Wendy Blount.
- http://wendyblount.com/encycEntry.cfm?ENTRY=16&COLLECTION=EncycIllness&MODE=full

Escape the Planet Urine
- Information about litterboxes, placement, training, behavioral problems and cleaning. Produced by a company selling a pet product.
- http://www.escapetheplaneturine.com/pettips/dsp_housetrainCatMain.cfm

Animal Network Forums: Litter Box Concerns
- Discussion group on house training cats.
- http://www.catfancy.com/anforum/forum.asp?FORUM_ID=24

Aston Woods Pixie-Bob: Pet Soiling
- Addresses inappropriate soiling, medical issues, the cause of the problem, spraying and what not to do.
- http://www.astonwoodspixies.com/SoilingSpraying

Purina: Spraying
- Explanation of reasons for spraying with treatment suggestions and possible related health problems.
- http://www.purina.com/cats/behavior.asp?article=118

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.
- http://www.purina.com/cats/behavior.asp?article=123

How to Toilet Train Your Cat
- Step by step guide to how to train your pet to use a human toilet.
- http://www.karawynn.net/mishacat/toilet.html

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.
- http://home.gci.net/~divs/behavior/toilet_cat.html