Frances Bean Cobain's Dog Dies
updated 03/28/2013 AT 05:00 PM EDT
•originally published 03/28/2013 AT 12:40 PM EDT
"I am beyond devastated," she wrote. "I will miss his giant head and alien/gremlin personality & his big dumb dopey grin."
Explaining that the pup passed away during surgery while under anesthesia, Cobain, 20, continued, "Essentially he died in his sleep, which is all I could've asked for. I am greatful his suffering has ended & that he is somewhere peacful without pain."
In addition to Uncle Fester, Cobain is a pet parent to a cat named Elvira and a second orange-haired kitty. The star, who is the daughter of Courtney Love and late Nirvana frontman Kurt Cobain, also lost cat Zero last year after she went missing.
Of her beloved bulldog, Cobain concluded, "I'm greatful for the love he exuded & the happiness that filled my life because of his existence ... He will forever be embedded in my heart & I will miss him eternally."