National Council on Pet Population Study & Policy (NCPPSP)
The Shelter Population Index Study (NCPPSP)
The Top Ten Reasons for Pet Relinquishments to Shelters in the United States (NCPPSP)
Pet Overpopulation (AHA)
The National Federation of Humane Societies

Breeds
Hill’s Cat Breed Catalog
Hill’s Dog Breed Catalog
Petfinder Cat Breed Guide
Petfinder Dog Breed Guide

Cats
AHA: Indoor Cats vs. Outdoor Cats
AHA: Is a Cat Right For You?
HSUS: Adopting From an Animal Shelter or Rescue Group
HSUS: Bringing Your New Cat Home
HSUS: Cat Care Essentials
HSUS: Cat-Proofing Your House
HSUS: Choosing the Right Cat For You

General Resources
AHA: Pet Meets Baby: A Guide For Families Bringing Children Home to Pets
Common Myths About Shelter Pets
Dogster: Choosing Dog Names
Petfinder: Six Common Misconceptions About Pet Adoptions

Lost and Found
AHA: Identification Tags and Microchips
AHA: If Your Pet Gets Lost
AHA: What To Do If You Find a Lost Pet
LostPetUSA.net