The palace did not confirm or deny the story surrounding George’s name at the time.
Prince George was born on July 22, 2013, and his name is thought to be a tribute to his great-great-grandfather King George VI.
Royal watchers shared their sympathies with Will and Kate on social media, following news of Lupo’s death.
Royal author and editor-in-chief of Majesty magazine Ingrid Seward tweeted: “Very sad news that Lupo- The Duke and Duchess of Cambridge’s 9-year-old cocker spaniel passed away last weekend.
“Dogs are part of the family and losing one is heartbreaking.”
