This painting is one of the most famous portraits in the National Gallery. It's a very life-like painting of a famous racehorse called Whistlejacket by an artist called George Stubbs!

Whistlejacket was born in 1749 and his most famous victory was in a race over 4 miles for 2,000 guineas at York in August 1759. Stubbs's huge picture was painted in about 1762 for the 2nd Marquess of Rockingham, Whistlejacket's owner, and a great fan of Stubbs's artwork.