American Animal Hospital Association
http://www.aahanet.org/

American Veterinary Medical Association
http://www.avma.org/

Chicago Veterinary Medical Association
http://www.chicagovma.com/

ASPCA (The American Society for the Prevention of Cruelty to Animals)
http://www.aspca.org/

Humane Society of the United States
http://www.hsus.org/

Animal Emergency Referral Center
http://www.aercenter.com/

Almost Home Foundation
http://www.almosthomefoundation.org/

Flint Creek Wildlife Rehabilitation
http://www.flintcreekwildlife.org/