The "World's Cutest Dog" has passed away.
Boo's owners broke the news on Facebook Friday night saying, "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."
Buddy was Boo's brother who died in 2017. Their owner said that shortly after Buddy died, Boo began having 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."
Boo lived to be 12 years old. Rest in peace, sweet angel.