If you didn’t know already, Boo, a Pomeranian dog, was an internet sensation and was termed “the world’s cutest dog”. He was also a brand ambassador for an airline company. Currently, he has a following of almost 17 million people on Facebook.

He gained so much fame in so little time, all based on his cute little face. Sadly, the 12-year-old dog passed away in his sleep due to a heart condition.

Boo had a friend called “Buddy”, who passed away in 2017 as well. The family wrote, “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.”

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rawr. #costumeflashback

A post shared by Buddy Boo Blue Benny (@buddyboowaggytails) on Oct 12, 2018 at 10:26am PDT

Boo’s owners announced his death with a heartbreaking Instagram post.

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Dearest friends of Boo, 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. Our family is heartbroken, but we find comfort knowing that he is no longer in any pain or discomfort. 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. Since starting Boo’s FB page, I’ve received so many notes over the years from people sharing stories of how Boo brightened their days and helped bring a little light to their lives during difficult times. And that was really the purpose of all this…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. Over the years Boo met some super cool people, a lot of crazy talented people, but most of all so many kind people…friends who gave him endless love, people who prioritized his comfort over getting that perfect picture, partners who understood that Buddy ALWAYS had to be included, and last but definitely not least, the amazing doctors, therapists, and staff at Adobe Animal Hospital and Sage Veterinary Centers for the countless hours of care and dedication they poured into Buddy and Boo. I brought Boo home in the spring of 2006 and so started the greatest, most heartwarming friendship of all time. Shortly after Buddy died, 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. Boo, we love you with all our hearts and will miss you until the day we meet again. Have fun running around with Buddy and creating adorable mischief wherever you guys go. 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. With love and our deepest gratitude, Boo’s humans

A post shared by Buddy Boo Blue Benny (@buddyboowaggytails) on Jan 18, 2019 at 6:29pm PST

He died in his sleep and was suffering from heart problems since his friend, Buddy, had left them. “Boo’s humans” have described him as a dog who loved bringing smiles to everyone’s face, all around the world. The 12-year-old dog surely seemed like a pleasure to have. He was adored all over the world by his fans and he held a special place in his owners’ hearts as well!

Moreover, Buddy and Boo were BFF goals.

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we’ve been told that this photo is a little creepy. i didn’t know that creepy was another word for awesome. last weekend before halloween!! don’t be that family that gives out raisins! or those mystery gross things wrapped in black and orange paper!

A post shared by Buddy Boo Blue Benny (@buddyboowaggytails) on Oct 26, 2018 at 9:24am PDT

They were SO cute together! My heart is literally breaking right now.

Boo was so adorably cool that celebrities wanted to have meet and greets with him! Here’s a picture of Boo and Buddy with Anderson Cooper, an American journalist.

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ok so we’re not in costumes here as i promised, but this showed up in my memories and i had to share. 5 years ago today, buddy and i met a human dressed up as a silver fox. to this day the bookmark we got in his likeness is human’s greatest piece of schwag she’s received. if someone seeing this can send us a box of them, we can retire happy. #boobear #buddyfox #silverfox

A post shared by Buddy Boo Blue Benny (@buddyboowaggytails) on Oct 11, 2018 at 9:17am PDT

People had a lot to say about Boo’s fautgi. Some literally couldn’t take it…

this is actually me sobbing over boo dying pic.twitter.com/nCvNjsxp19

— gaby (@wtvrgabs) January 19, 2019

Ugh, same.

Boo the dog died and honestly I’m so sad right now https://t.co/CYrfiDcSx9 pic.twitter.com/Dc72g4aLTV

— Saira Khan (@sairakh) January 19, 2019

What a crappy start to the year

2019 has officially taken Boo the Dog away from us and I’m legitimately upset pic.twitter.com/7wwrIQRKw3

— happy new yerin (@erinadequate) January 19, 2019

People have cancelled the day. Cant. Deal. With. Boo. Not. Being. Here.

Boo the cute little dog died and today is GARBAGE

— Samantha Sunseri (@seastone130) January 19, 2019

Boo has definitely left a legacy behind. We all loved scrolling through his cute photos Instagram! He was also one of the most liked celebrity dogs on the planet. Well, he’ll still be the cutest dog for everyone.

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telling the weekend who's boss. #friday

A post shared by Buddy Boo Blue Benny (@buddyboowaggytails) on Jan 29, 2016 at 10:46am PST

Was Boo one of your favourite celebrity dogs, too? Let us know in the comments section about how you feel that Boo isn’t with us anymore.

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Cover image via Facebook/Boo