Do you sponsor any pets?
Sponsoring a pet is an easy way for you to make a difference.
I just came across this site today, where you can sponsor a guinea pig in need:
http://sponsoraguineapig.blogspot.com/
The pet of the month is Pablo from Orange County Cavy Haven (I have volunteered for this organization in the past), a blind and deaf guinea pig that is unable to eat on his own. Poor thing!
Of course, there are many other rescues and organizations out there that need help. A quick search on the internet will find you many results near you.