Eloethan Slinging a plastic bag of dog poo into the undergrowth (which some dog-owners seem to think is the right way to dispose of it) certainly means that it takes longer to rot away than leaving it out in the open.
It also means that the plastic lies around until it is eaten by wild animals, and causes internal blockages and a prolonged, painful death.
If people can't be bothered putting the bag of poo into one of the bins provided, or taking it home to their own bin, the least they could do is to carry a trowel and lob the bare s***e away from the path.