So many organizations out there are working hard for animals, either a particular species or breed, or all of them. WSPA (World Society for the Protection of Animals) is one of the latter. Click on the link to learn more.
Any animal you are interested in, just type in its name and "rescue" or "sanctuary" after it, and you'll find many groups working for its benefit and, very possibly, some in your own geographical area.
Click on the pictures to visit some of my other favorites: