I just wrote this:

Eight Belles in the wind
Beautiful melody that will never end
Running free now without pain
May your death not have been in vain

You ran for the roses with heart and soul
True to your lineage from long ago
With heavy hearts, our tears fall
You shouldn't have died at all

The rainbow bridge is now your home
With never ending pastures to roam
Eight Belles in the wind
Beautiful melody that will never end