Maya, PewDiePie's cherished pug, passed away at the age of 17.
The grieving 33-year-old YouTuber paid tribute to his friend earlier this week on Instagram.
PewDiePie, whose true name is Felix Arvid Ulf Kjellberg, thanked the dog for "making my days brighter" in a series of photos from their time together over the years.
Said goodbye to my little Maya this morning, PewDiePie wrote. Although 17 years is a long time for a pug, there was never enough time in the world.
I didn't believe I could love a dog with the same intensity as I did her.
"Thank you for the fantastic time we had with you, for always making my days happier, and for bringing Marzia and I closer together.
You will always be in my heart, Maya, and I already miss you a lot.
The YouTube sensation has been candid about Maya's health issues, including the dog's early diagnosis with dementia.
We'll see how she develops, he earlier stated in a video. Maya, meanwhile, has the "dementies." She is really old. Her mental faculties are deteriorating a bit.
The estimated value of PewDiePie's net worth is $30 million (£24.7 million).
He has the highest YouTube subscribers in the world (111 million), and in 2016, Time magazine named him one of the most influential people.
Johanna and Ulf Kjellberg, his parents, are both effective Chief Executives of their respective firms in Sweden.
Eight years after they first met, PewDiePie wed his longtime partner Marzia Bisogin in a stunning London ceremony in 2019.
The pair moved to Brighton with their two pugs, Edgar and Maya, after getting married at Kew Gardens' Temperate House and Nash Conservatory.