A marathoner in China had a special companion tag along with him.
A stray dog started following Dion Leonard during a week-long race across the Gobi Desert.
The dog he nicknamed "Gobi" stuck with him for days, running 77 miles by his side.
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PHOTOS: Dog tags along with marathon runner in race across Gobi Desert
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This image shows extreme marathon runner Dion Leonard with the dog he nicknamed "Gobi" after he tagged along for 77 miles of his trek.