This is a more elegant title for a pooper scooper service. Basically, you target homeowners as your clients and clean up their yards once or twice a week. You charge by the hour or by the call. Once you establish a nice clientele, consider hiring others to perform the task. You act as the agent who books the gigs. Contact residential townhouse communities that have dog runs. They need to be kept clean by the management. They might gladly hire you to do the work. Charge whatever your market will bear