Our shelter has...around 90 cats currently. Some of which are available and some that are not (yet). Our Humane Society put out a plea in some of our local newspapers about our high relinquishments have been, and that even if you weren't 'looking' for another cat, if you could possibly afford another one it would make a huge difference. And WOW did that make a difference in cat adoptions! In the last two weeks we've had close to 40 adoptions! We had in one day, 7 cats go home! When you only have a population around 100, 40 cats makes an enormous difference. Just a month and a half ago, we had about 170 animals, most were cats, with maybe 15 dogs, and a few smallies (hamsters, guineas pigs).
I will honestly never understand why people don't spay/neuter their pets. Both of mine came pre-sneutered because they were both adopted, but I will always do it no matter where I find my animal. It is incredibly sad, but our shelter is lucky that we have the luxury to only have to euthanize animals with severe behavioral or medical issues and never purely based on resources.