Once upon a time there was a little dog named Rosco that lived in our neighborhood. As we left for work and school, Rosco roamed the subdivision without a care in the world. When we returned home at the end of the day, Rosco was still walking the streets in the subdivision, enjoying life. Rosco Run. Rosco Fun. is a picture book about a dog enjoying a day of leisure, such as sunbathing at the pool and riding his bicycle, in a neighborhood.