FreeKibble.com and FreeKibbleKat.com are one of the best sites out there. Each day, go to the site and answer a question about dogs (for free kibble) and cats (for free kibble kat) and for each answer, it doesn't matter if it is right or wrong, they will donate 10 pieces of Kibble to feed shelter pets who might not get any food without them.
For at least the past 2 or 3 years, I've been going there every day, donating more and more. A lot of cute, furry (or not), shelter pets, and FreeKibble owners and participants would truly appreciate your help.
Get going today!