(CNN)Queen Elizabeth II has lost another of her beloved dogs, British tabloid The Sun reports.
Vulcan, a dorgi, is reported to have died at Windsor Castle, leaving the British monarch with just one remaining dog -- another dorgi, named Candy.
A palace source told the newspaper that "clearly the loss of a loved pet is upsetting."
A dorgi is a cross between a dachshund and the corgi breed, famous for its distinctive short legs and standing-up ears and its popularity with the Queen.
In 2018, the Queen lost Willow, the last descendant of her original corgi, Susan, the dog she received on her 18th birthday in 1944.
She was reportedly so attached to Susan that she took the dog on honeymoon with Prince Philip in 1947.
The Queen's dogs have never shunned the limelight -- four of the royal pooches appeared with their owner on the cover of Vanity Fair in 2016.
The monarch even appeared beside James Bond actor Daniel Craig with her dog Willow for a sketch shown during the opening ceremony of the 2012 London Olympics.
The Queen's fondness for horses and equestrian pursuits, including racing, is well known.
In June, she was pictured pictured riding on horseback in Windsor, west of London, in her first public appearance since the UK's coronavirus lockdown began.
The 94-year-old Queen could be seen riding around Home Park, next to Windsor Castle, wearing a green jacket and a colorful scarf.