WATCH: Dog waves 'Boston Strong' flag for marathon runners every year since 2015

Meet one of the most-popular race supporters of the Boston Marathon

April 15, 2019 - 3:40 pm

(KMOX) - Since 2015, the Boston Marathon has been attended by a very, very good boy. 

Related: Winner crowned at Boston Marathon after dead sprint to finish line

Spencer is a gold retriever who has been supporting runners of the annual marathon through rain or shine. He went viral last year, when his owner Rich Powers shared video of him out in the cold, rainy weather still holding his flags that said "Boston Strong." 

They were stationed near mile-marker two again this year, hoping to push the runners to continue on their 26.2-mile run. 

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