10/03/2012 at 11:00 AM EDT
is heartbroken and she wants her fans to pray.
"Please pray for my baby girl Lila," Cyrus Tweeted
Tuesday night. "She is in the hospital. I am so heartbroken. Please send out vibes for her to not be afraid & to heal."
The singer didn't specify what was ailing her Yorkie, but she asked her Twitter followers for their positive thoughts.
Cyrus, who has four other dogs – Mary Jane, Floyd, Ziggy and Happy – with fiancé Liam Hemsworth
, has always had a special place in her heart for her little Lila
, who joined the family in 2011.
"I think Lila must be an angel," she Tweeted