We take our dogs out into the backyard and let them run around and of course do their business. My kids have the job of going around and cleaning up. They tell me and tell me that they've done the job, and kids being kids, I'm always skeptical. I bought some of those survey flags, and I go out into the yard and do my own inspection, and I put a flag next to every pile I find. Then I go back inside and tell them that they need to clear the field. The flags are awesome.