Here are some helpful and informative websites:
Animal Shelters & Rescues
L.A. County Dept. of Animal Care & Control
The Humane Society of the United States
Pacific Coast Dog Rescue - rescued dogs for adoption!
Pet Loss & Grief Support
Animal Advocacy
CHAKO - Dog Lobby and Advocacy
Pet Sitting Associations
Professional United Pet Sitters Association
National Association of Professional Pet Sitters
Everything else