I personally wish there was a law forbiding anyone to have a dog or cat unless they had it spayed/ nuetered within the appropiate time. It should be a free service EVERYwhere. I've known of too many cases of people just dumping puppies or kittens by the side of the road. It's sickening!
Maybe the idea of using euthanized animals from the shelters as feeder foods for zoos would draw much attention to the national crisis of unwanted pets. Something needs to be done.