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A border collie in Ponder, Texas, worked diligently, if fruitlessly, to track down the "other dog" after being startled by his own reflection. Video filmed by owner Kellie Harrington on February 7 shows Pfi the border collie encountering himself in a mirror and searching the area to find the intruding dog. "I was working in the barn and had closed a door partially that typically remains open, exposing a full length mirror that the dogs do not normally see," Harrington told Storyful. "I was playing ball with our dog, named Pfi, and realized he kept stopping to go into the room to look for another dog." (Footage by @kellievet/Storyful via Getty Images UGC)