The National Heritage Centre for Horseracing & Sporting Art is up against the Tate Modern for a £100,000 prize
The diminutive gelding, who won the 2004 Grand National for the late Ginger McCain, has died aged 25.
'The little brown horse has to learn his craft, but will Blueberry be able to display his amazing potential?'
'For the first time in my life I have the time to devote to telling my story'
The pair have put their tricky start in life behind them and are blossoming in their eventing careers
A bridleways group is calling for a change in the law to protect horses and riders