The phenomenon you observed in the 1930s was most likely due to the presence of radium, a radioactive material used in watch dials during that time. Radium emits radiation, which can cause certain materials, like dog feces, to glow in the dark when exposed to it.
However, since then, there have been significant changes in regulations and safety practices regarding the use of radioactive materials. The harmful effects of radiation on human health became more widely understood, leading to stricter controls and guidelines for handling such substances.
Today, radium is no longer used in watchmaking or other consumer products due to its potential health risks. Therefore, you are unlikely to come across glowing dog feces caused by radium exposure nowadays.
It's important to note that if you ever encounter any unusual or potentially hazardous substances, it is best to avoid direct contact and consult with appropriate authorities for further guidance.