One of the cutest dogs in the world has passed away from a 'broken heart'

It’s with heavy hearts that we announce that the world’s cutest dog, Boo the Pomeranian has died.

The adorable little pup – who became a viral sensation online - reportedly passed away from a "broken heart" one year after his best friend, Buddy, died.

Boo’s devastated owners shared the sad news on Facebook, with Boo’s legions of fans.

"With deepest sadness, I wanted to share that Boo passed away in his sleep early this morning and has left us to join his best friend, Buddy," the statement read.

"Boo showed signs of heart issues. We think his heart literally broke when Buddy left us. He hung on and gave us over a year. But it looks like it was his time, and I'm sure it was a most joyous moment for them when they saw each other in heaven.

"Thank you to all of you for following along on their silly adventures over the past 10 years. They sure had a LOT of fun."

"Our family is heartbroken, but we find comfort knowing that he is no longer in any pain or discomfort," the post continued.

"We know that Buddy was the first to greet him on the other side of that rainbow bridge, and this is likely the most excited either of them have been in a long time."

"Boo brought joy to people all over the world. Boo is the happiest dog I've ever met. He was so easy going that we never had to bother with training.

"He made the manliest of men squeal with delight over his cuteness and made everyone laugh with his quirky, tail wagging personality."

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Boo had more than 16 million fans, and was even the star of his own book, Boo: The Life of the World’s Cutest Dog.

Rest in peace, Boo!