Donate
The Humane Society is a non-profit organization and exists in part thanks to volunteers and donations. I've attached some links for the different ways you can support The Humane Society. In addition to them, there are many other fantastic shelters you can support locally.
adopt
The next time you're looking for a new, furry addition to the family, check out your local Humane Society or other shelters in your area. Not all have a location, either, but have foster families taking care of animals until they're adopted, so don't be afraid to use the internet, just make sure you do your research.