Therapy dog returns to Boston Marathon to cheer on runners

Hundreds of thousands of spectators showed up to cheer on the runners of the 123rd running of the Boston Marathon. And, one of those spectators was a Golden Retriever named Spencer, who -- for the second year in a row -- made an appearance to show his support.

Last year, Spencer was seen in a viral video, carrying two flags in his mouth while athletes ran by him.

After seeing how much of an impact Spencer had on the runners, owner Rich Powers brought him to the race again -- this time dressed in a bright, yellow raincoat to keep him dry and a “We Are Boston Strong” flag in his mouth as his way of cheering on the runners.