The Humane Society is the charity I always go withhttps://secure.hsus.org/01/makeadonation?source=gabam3
and of course theres always the aspca
http://www.aspca.org/site/PageServer?pagename=donate_home
heres a site that is used for several different charities. check out all their members. there is a large list of organizations.
http://www.animalcharitiesofamerica.org/memberset.asp
am i correct in assuming the wild wild west is in america? because these are all american charities. im not really familiar with others...