Operations and Maintenance for parks, woodlands and public spaces in a dynamic community In Arlington we manage 10 dog exercise areas, some that are 15 years old. We are interested in developing sustainable practices in those areas. Pandemic saw a 30% increase in the dog population in our 25 square mile County. The estimated number of county dogs is 85,000. The eye catcher is that the average waste per dog per day is .75 lb per day.