Admittedly, some of the cats that are killed are unwanted youngsters and others arrive in shelters as the unfortunate spin-offs of modern life, but directly or indirectly, behavior problems are at the root of much of the carnage. Most cats arriving in shelters have not been trained and failed to develop a proper bond with their owners. Training, though an invaluable preventative strategy, will not circumvent all behavior problems. Some of these problems are "on the cards" anyway due to familial, environmental, and medical factors.
So when behavior problems are established, from one cause or another, can they be successfully treated? The answer is yes, for most of them, anyway. With the current state of knowledge, the majority of seemingly refractory behavior problems are now resolvable as long as the cat owner is prepared to consult an appropriate expert and follow through with his recommendations.
The number one behavior problem in cats is inappropriate elimination. Owners can tolerate a lot from their cats but when their carpets and floors are ruined by cat urine, and the house begins to smell like a latrine, it's often the last straw. Other common cat behavior problems are aggression, either owner-directed or between cats, fear-related behaviors, and compulsive behaviors that cause problems for the cat and perplex the owner. What can be done to thwart these behavior problems?
Prevention is always better than cure. If an owner selects a cat, with a temperament suited to his or her lifestyle, understands his needs and limitations, and socializes and trains the cat to be a good pet, there is no reason why that cat should not turn out to be a highly valued friend for life. Owning a well-behaved and friendly cat is a pleasure that enhances the quality the lucky owner's life. Fortunately this utopian situation is not a rare occurrence and a little forethought and planning makes it come true for many people.
However, the old adage, "When they're good they're very good, but when they're bad they're horrid," does apply to some cats. Occasionally "horrid" cats are not so much born that way (though genetic factors are often involved) as they end up that way as a result of inappropriate/unfortunate lifetime experiences. With cats, in particular, it is extremely important to understand them and to work hard to foster a cat-friendly environment for them, paying particular attention toward establishing positive inter-cat and cat-to-human interactions.
Early in their lives, cats should be shielded from extremely adverse experiences and pain that can lead to fearfulness, with or without aggression. All cats also should be provided with meaningful activities to keep them occupied, particularly if they must be left alone for extended periods. Like humans, cats need "a job" if problems arising from boredom and frustration are to be avoided. The results of appropriate selection, proper raising, care and management, and training of cats is so extremely gratifying that it behooves us all to learn as much as we can about these subjects so that we can be successful "cat parents." The look in a closely bonded cat's eyes and her affectionate squints and raspy purrs let us know when we have succeeded in our quest and is reward enough for all our endeavors.