I think if someone came up with a liquid solution that could be easily carried and sprayed on dog poo, such that it harmlessly (to either the pavement or grass/soil it was deposited upon) dissolved in the space of a few minutes leaving nary a trace… that person would become very very rich.

You want a spray that converts dog poo into dog diarrhea, and you think thats better?

Dog poo is detrimental to the environment and us, so that would only make things worse actually.