Dog waste is litter and it is unlawful to leave it on public or private properties. You can report a particular individual to the Livability Court at 843-805-3226, please provide as much documented evidence as you can. This has become such a problem that the city has an entire program dedicated to it. Learn more at: https://www.charleston-sc.gov/1414/PUP-Program-Pick-Up-After-Your-Pet