Can't see a bit of wee being in the same league as the industrial strength fertilizer, pesticide spray, cow wee (have you actually seen how much 1 cow pees? Quite impressive and there are literally thousands of em round here too...) and all the other pollutants (grease , oil, diesel , chip fat , plastic bottles) etc etc....
Dog poo is best moved to the underneath of a hedge where it naturally degrades, like all other animal poo does in the wild. No bags required, just a small shovel!
Edit to close parentheses...