Cat Behavior
Animal Forum
The Cat Site
Feline Behavior Guidelines(American Association of Feline Practioners)
  Multicat Households: Keeping the Peace (Cat Behavior Associates)
Problem Scratching and How to Stop It by Anne Moss
Spraying - When Your Cat Uses Urine to Mark Territory by Anne Moss
Veterinary Partner
Dog Behavior
Common Dog Behavior Issues (ASPCA)
San Francisco SPCA Dog Behavior Library
Veterinary Partner