When Wentworth was remodelled under a later Earl Fitzwilliam, a 40-foot square "Whistlejacket Room" was created to showcase the painting, with only single family portraits by Sir Joshua Reynolds and Sir Thomas Lawrence to keep it company [REF].
Another reason popularly given for it being "unfinished" is that Rockingham was so impressed by Whistlejacket's furious reaction when confronted by Stubbs working on the painting in his stable, that he ordered it hung without further decoration.