In this country dogs occupy the same place as cows do in India. Poisoning strays would get you more jail time than robbing a bank.
Americans do not favor poisoning. Shooting, however, if done discreetly, is far more effective.
Today we have animal control agencies that captures strays, then take them to shelters to be identified or killed. In some places they do it with heart injections, in others, gas chambers. Most people accept what they do, and just don’t think about it.