According to the Humane Society of the United States, an estimated 3 to 4 million cats and dogs are killed at shelters across the nation each year.
Unaltered cats and dogs only add to this ever-growing problem.
http://www.examiner.com/article/alabama-considering-the-elimination-of-low-cost-spay-and-neuter-clinics?CID=examiner_alerts_article