Evaluating the effectiveness of Legislation requiring Mandatory Spay/Neuter (MSN)

Many municipalities have implemented mandatory spay/neuter ordinance with very mixed results. The ASPCA recognizes that sterilization is currently the best method to reduce the intake and unnecessary killing of companion animals. However they say having low cost spay/neuter programs readily accessible to your community is more effective than MSN. Accessibility of services and cost are the primary barriers to spay/neuter surgery.