Miley Cyrus still hearbroken over dog's death

Pop star Miley Cyrus is still devastated following her dog's death last month.

The Adore You hitmaker - who recently resumed her Bangerz world tour after being hospitalised last month for a severe allergic reaction to antibiotics - was left heartbroken when her beloved Alaskan Klee Kai, Floyd, was killed by a coyote and feels very guilty for his death.

In a lengthy post about her grief on Twitter on Saturday, the 21-year-old star wrote: "There's nothing I want more than to lay and drown this pillow in my tears & think about all my shoulda, coulda, wouldas (sic)."

She added: "I keep asking why would the world take my sweet boy from me? I'm just a baby myself...I depend on my mother still. She is the one at the end of the day I want to hold me when I'm sad, scared, lonely. Her one job in this world is to eel me out of harms way...I was Floyd's mommy. I don't know when the regret and the guilt will fade. I don't know if it ever will.

"I feel like I let my boy down. My job was to protect him and I'm not a person that takes failure lightly...Today is one of those days where I can't open the curtains to see the sun...open the windows to hear the world going on around me because to be honest I hate the fact that the world's still spinning. I want it to stop...I want everyone's heart to break the way my heart is breaking."

She concluded: "No matter how much I cry or beg of 'god' to wake me up from this nightmare, it is what it is (at least that's what everyone keeps reminding me). There's no waking up from reality so today I am being a helplessly hopeless human & I'm ok with that."

She also shared photographs of herself looking very sad in her hotel room in Ireland, with the caption: "#saddayinDublin."