My boots are strickly for hunting. They are rubber swamp boots. They come off my feet before I leave the area and go into either a rubber made container filled with leaves and dirt, or a trashbag with the same contents.
They have never walked on pavement, concrete, a store or even been in my truck (cab).
I guess it would be possible for me to step on something like a pile of doo-doo, but unlikely, unless it was deer doo-doo...