The Pomeranian Boo and his companion Buddy, who died last year, became internet sensations when their American owners started sharing pictures of their adorable antics.
"Shortly after Buddy died, Boo showed signs of heart issues, we think his heart literally broke when Buddy left us," his owners wrote. "He hung on and gave us a year." But it looks like it was his time, and I'm sure it was a joyous moment for them when they saw each other in heaven.
"Our family is heartbroken, but we find comfort knowing that he is no longer in any pain or discomfort," added, noting that Boo, "brought joy to people all over the world."
The announcement was with with shock from Boo's fans, several of whom said they were in tears at the news.
Venus The Two Face Cat, a Chimera cat with over a million Facebook fans, "" He's a true legend and we've enjoyed 6.5 years. "
In addition to his social media presence, Boo was appointed in 2012 as Virgin America's Official Pet Liaison. He also had a book deal, appearing in photo books including "Boo: The Life of the World's Cutest Dog," published in 2011.