This was a tail for the record books.

Alice Varesco, a former Olympic skier, got the shock of her life when she spotted her dog on national TV — sprinting down the homestretch of a Winter Olympic cross-country race, according to The Daily Mail.

The 35-year-old trade marketer and her husband, Enrico, who live near the course in Italy, thought they’d left two-year-old Nazgul securely locked in his kennel before heading out to watch the women’s race Wednesday morning.

Not a chance.

Minutes later, friends flooded Alice Varesco’s phone with footage of her Czechoslovakian Wolfdog racing across the finish line on live TV, gleefully chasing skiers from Greece and Croatia — and his own shot at Winter Olympic glory.

“I thought it was impossible,” Varesco said. “We left him in his kennel and the door was closed so I couldn’t understand how it could be him.”

Although Nazgul was coaxed out of the way of the athletes, he slipped away again.

“I was so embarrassed,” she said. “When they told me he had escaped again after they caught him, I just thought, ‘Oh no, not again.’”

His antics made some viewers laugh, while others were unsure.

“I was like, ‘Am I hallucinating?” said Tena Hadzic, a 21-year-old Croatian skier who encountered the dog on her trip down the homestretch. “I don’t know what I should do, because maybe he could attack me, bite me.”

Greek skier Konstantina Charalampidou, who finished last, said, “It was funny. He made me forget about the race because it wasn’t good. Thanks to him, I’m famous now, so I have to thank him.”

The embarrassed owners said clever Nazgul — described as “stubborn but very sweet ” — must have figured out a way make a break for it and get in on the action.

“We apologized to the organizers,” Varesco said, “because we knew things could have gone wrong, but they were just relieved nothing serious happened.”