yeah Rocky started around 3-4. it only got worse and became an obssesions. anything i tried only succeeded in ruining our recall and harmed our relationship at one point.
The best option for us was to avoid places with poop and pick up right away. this was a huge huge huge issue at dogs parks and really, even just trails where dogs are supposed to be on leash. Heck, he'll eat some on leash off the side of the sidewalk sometimes!