The city of Los Angeles, for example, put to death 110,000 dogs in 1971. After a low-cost sterilization program was put into effect, by 1986 the number had dropped by nearly half.
比如洛杉磯在一九七一年有十一萬隻狗被處死；低成本的結紮方式推出後，到一九八六年數目下降到只剩一半。