Founded in 1877, the American Humane Association is the only national organization dedicated to protecting both children and animals. A nonprofit membership organization, American Humane is headquartered in Denver. READ MORE Directly from their website: PROTECTING ANIMALS American Humane has worked to protect animals since 1877, providing a voice for the nation's most vulnerable.
All efforts of our Animal Protection Division are focused on preventing cruelty, neglect and exploitation of animals and assuring that their interests and well-being are fully, effectively and humanely guaranteed by an aware and caring society.
From here, you can learn the many ways you can help an animal, find out about American Humane's numerous animal welfare programs, get information on adopting and caring for new pets, and more. 
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If anyone has direct experience or knowledge about this organization, please let me know. I would be very interested in knowing more about them.