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Matt Porteous / The Duke and Duchess of Cambridge/Kensington Palace via Getty The Cambridge family Christmas card
Although William and Kate have yet to share any photos of the black cocker spaniel, the pet has been a welcome addition to their family.
"The new puppy is adorable and the whole family are besotted," a friend told The Mail on Sunday, which first reported the news.
"They were devastated when Lupo passed away," the friend added. "It was hoped that a younger dog would give Lupo some company and give him a little more life and energy."
Last May, James, 33, announced that his dog Luna, Lupo's sister, had welcomed "six healthy little pups."
James went on to share that he wouldn't be keeping the puppies himself as "they all have lovely homes waiting for them."
William and Kate announced the sad news of Lupo's death on Nov. 22.
"Very sadly last weekend our dear dog, Lupo, passed away. He has been at the heart of our family for the past nine years and we will miss him so much," they wrote on social media, alongside a photo of the adorable black cocker spaniel.
Kate's brother also shared a touching tribute to the late canine.
"It is with great sadness that Lupo, the beloved dog of my sister Catherine and her family has passed away. Lupo was the son of Ella, brother to Zulu, Inka & Luna," he wrote. "Nothing can ever prepare you for the loss of a dog. For those who have never had a dog, it might be hard to understand the loss. However for those who have loved a dog know the truth: a dog is not just a pet; it is a member of the family, a best friend, a loyal companion, a teacher and a therapist."
"Rest in peace Lupo," he added. "You will always be remembered and your legacy will live on forever. Good Boy 🐾."
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Matt Porteous/PA Wire Prince George and family dog Lupo
Lupo had previously starred in several family photos, including an early photo of George, now 7, with his parents.