It's a Dog's Life (Hank the Cowdog Series #3)

Hank hitches a ride into town to visit his sister, Maggie, who never really took to ranch life. Maggie doesn't like swimming in the sewer, chewing on old bones, or digging in the mud. So, it's up to Uncle Hank to teach Maggie's four pups the basics of their cowdog heritage, beginning with Garbage Patrol.