When we domesticated animals thousands of years ago, we interfered with nature. Now we have created an overpopulation of animals worldwide. Most animal offspring are more likely to being euthanized, abused or neglected than to find a good, loving home. Therefore, the natural right to reproduce is inferior to the responsibility we have to protect our animals from an otherwise short, sometimes cruel life, and horrible death. It is our duty, as humans, to help and protect animals. This crisis is a result of human interference: it is our obligation stop the cycle.