National Animal Welfare Organizations

ASPCA, Companion Animal Care 
Humane Society of the United States, Pet Care

National Associations

American Kennel Club
American Reptile association
Cat Fancier’s Association, Caring for Cats
Pet Bird Clubs and associations

Veterinary

American Veterinary Medical association, Care for Pets
Veterinary Information Network, Pet Care
American Animal Hospital Association, Pet Care Library

Training and Behavior

Wag’ n’ Train, clicker training for all species
American Dog Trainers’ Network

Zoonoses 

(diseases)

Reptiles and Salmonella

US Government

Reptile and Amphibian Communities in the US