I work at a 'no-kill' shelter. We put animals down if they have extremely bad health or extremely bad temperment problems. It is mainly the dogs that go down for temperment, as I have not seen a cat put to sleep for that reason yet. Yes, we do have limited room, and yes we do have to turn animals away. We do not, however, turn away adoptable pets. An animal is temperment tested and then it is decided if we will accept it. I realize that when one is rejected, it probably ends up at the city shelter or on the streets. We do not take that lightly and our canine behaviorist cries every time she has to reject one. It is a thing that lies heavy on all our hearts. We do the best we can though, and try to help as much as we can. There is no perfect solution for a shelter and until people start acting more responsibly, we will always have this overpopulation problem on our hands.