Credit: Jason Merritt/Getty Images

Miranda Lambert has had a rough start to 2012.

After mourning the loss of her best friend, who was killed in a tragic car crash, and father-in-law, Dick Shelton, the country darling had more sad news to contend with Friday: The death of her beloved pet pooch, Dixie.

"My dog died Thursday. My parents just told me," she tweeted Friday. "Headed now to bury my friend of 20 years."

Thanking fans for their support and words of encouragement, Lambert added a heartfelt follow-up tweet.

"I hope what they say is right: 'What doesn't kill you makes you stronger,'" she wrote.

Lambert, 28, and her husband, Blake Shelton, are expected to travel to Indianapolis, Ind. to sing "America the Beautiful" before Sunday's Super Bowl XLVI.