Her death marks the end of an era, leaving the monarch without a corgi for the first time since 1944. One could hardly see a photo of the matriarch without a couple of her furry friends afoot. The Queen is reportedly heartbroken, as Willow had been with her for 14 years.
As a descendant of Susan, who was an 18th birthday present when she was then Princess Elizabeth, Willow had a particularly close link with the Queen.
"She does not like seeing her dogs suffer and she knows that sometimes putting a dog down is the kindest course of action - although that doesn't make her loss any less", a Buckingham Palace source told the news outlet.
She has two more dogs that are still with her - Vulcan and Candy - known as the "dorgis", a cross between a corgi and a dachshund.
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Castro became president in 2008 when his brother, Fidel Castro, formally handed over power as his health deteriorated. His was the only name put forward by a party-backed commission, and was greeted with a long ovation from lawmakers.
The dog and two other corgis, Monty and Holly, greeted the secret agent, played by Daniel Craig, as he arrived at the palace to accept a mission from the Queen. So well behaved, those pups! Holly, another one of Queen Elizabeth's corgis also starred in the video, but she passed away more than a year ago, at the age of 13.
The Queen is often associated with her love of Pembroke Welsh corgis, supposedly owning over 30 dogs of that breed during her reign - breeding her own, descending from her childhood pet, Dookie. "She didn't want to leave any young dog behind".
Though the Queen had to say goodbye to her long line of royal corgis, she's not done with being a dog mom just yet.
According to the source, the dog is now buried on the castle grounds. After the queen took a liking to a corgi brought home by her father King George VI in 1933, she was gifted her own, thus beginning a tradition of royal corgis.