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Spencer, the 13-year-old dog who cheered on marathon runners for years with a "Boston Strong" flag in his mouth on the route near Ashland State Park, died of untreatable liver cancer in February.
Rich and Dorrey Powers say they discovered their golden retriever Penny, Spencer's niece, died of cancer complications just over a week after Spencer's death.
Spencer, a golden retriever known for his adorable support of Boston Marathon athletes, has reached his finish line after another difficult battle with cancer.