British pop star Cheryl Cole is wracked with worry as her sick dog is due to undergo radiotherapy treatment this week (begs08Jul13).

The Call My Name hitmaker's pet pooch Kiera requires special treatment for an undisclosed illness, and Cole took to her Instagram.com page on Tuesday (09Jul13) to air her anxiety.

A message, posted alongside a photograph of the pup, reads, "This is my dog Kiera. I have had her since she was 2 months and I was 16. Tomorrow she has radiotherapy and will be in doggy hospital for 2-3 weeks.

"Will u (you) help me send her happy vibes and pray for her with me please? She's my oldest baby and it's breaking my heart."