ASPCA: American Society for the Prevention of Cruelty to Animals
Helps prevent cruelty and alleviate the fear and suffering of animals through humane law enforcement, education, spay/neuter programs, veterinary care, and adoption.

Canine Companions for Independence
Give independence to people with disabilities! Canine Companions change the lives of children and adults by providing service, companionship, and unconditional love.

Dogs for Disabled Americans
Trains rescued dogs and donated puppies to assist people who are deaf or physically disabled in leading more independent lives at work and at home.

Guide Dogs for the Blind
Enhances the independence and mobility of people with visual impairments by providing specially trained dogs at no cost to the blind individual.

Paws With A Cause
Paws With A Cause trains Assistance Dogs nationally for people with disabilities and provides lifetime team support which encourages independence. PAWS promotes awareness through education.

People for the Ethical Treatment of Animals (PETA)
We fight cruelty through education, investigations, grassroots campaigns, rescues, advocacy, and messages of compassion.

Spay-Neuter Assistance Program (SNAP)
Reduce dog/cat overpopulation by prevention, using mainly mobile clinics that take FREE and low-cost animal sterilization and wellness services directly into poor neighborhoods.

Elephant Sanctuary
The nation’s only natural-habitat refuge for endangered elephants retired from circuses and zoos. Improving lives of elephants through sanctuary, education, research and overseas assistance.
I had to include this one; I just love elephants!