The statement you mentioned about dog feces glowing in the dark during the 1930s is not accurate. There is no scientific evidence or historical documentation to support such a claim. It is likely a misconception or an exaggeration.
Dog feces do not naturally glow in the dark. The phenomenon of glowing feces would require some external factor, such as exposure to certain chemicals or substances, which is highly unlikely and not commonly observed.
If you haven't seen any glowing dog piles in recent years, it's because they simply do not exist under normal circumstances.