HEre are some different sites and links that may be helpful

Angels for Animals - angels4animals.org
Brown Dog Foundation - browndogfoundation.org
Canine Cancer Awareness - caninecancerawareness.org
Care Credit - carecredit.com
Cats in Crisis - catsincrisis.org
Extend Credit - extendcredit.com
Fairy Dog Parents - fairydogparents.org
Frankie's Friends - frankiesfriends.com
Gracie's Mission - graciesmission.org
Paws 4ACure - paws4acure.org
Shakespeare Animal Fund - shakespeareanimalfund.org
The Dog & Cat Cancer Fund - dccfund.org
The Magic Bullet Fund - themagicbulletfund.org
The Mosby Foundation - themosbyfoundation.org
The Pet Fund - thepetfund.com
The Riedel & Cody Fund - riedelcodyfund.org