I constantly run around the whole yard, and yet I never go anywhere. What am I?

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In everyday English, a fence “runs” around a yard. However, the fence itself doesn’t actually run.
Flickr/Robin Zebrowski
Flickr/Robin Zebrowski
I constantly run around the whole yard, and yet I never go anywhere. What am I?
- A dog on a leash
- Sprinkler
- A fence
- House
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