According to statistics from Britain's Royal Society for the Prevention for Cruelty to Animals, British streets support about 500,000 stray dogs a year. And in Chicago alone more than one million strays are caught and killed every year, giving it a reputation as the world's worst failure in canine population control.
根據「英國皇家防止虐待動物協會」統計，英國每年街頭約維持有五十萬隻流浪狗；美國僅芝加哥一市，每年要捕殺超過上百萬隻的棄犬，被國際公認為控制狗口過剩最失敗的例子。