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
This image shows extreme marathon runner Dion Leonard with the dog he nicknamed "Gobi" after he tagged along for 77 miles of his trek. (KGO-TV)