Links
Arizona Humane Society - this Phoenix-based Humane Society is awesome! Volunteer or adopt a pet!
Care2 - get a free email address that generates donations to various causes, like animal rights, domestic violence awareness and others.
University of Arizona Undergraduate Majors - check out the animal science-related majors that U of A has to offer (Bachelor of Science in Animal Science, Natural Resources, Veterinary Science)
C.A.N.T.E.R. - (Cochise Area Network Therapeutic Equestrian Resources) They are always looking for volunteers and donations. CANTER "promotes the health and independence of individuals with disabilities using therapeutic riding in a safe and caring environment."