Sooty was a placid, well shaped grey horse mare with a hint of dapple in her coat and a blackened mane and tail as well as nose and stockings. Cob had been training her until she was given to Fitz as a part of his education provided by King Shrewd. At the time she was with foal by Lord Temperance's stallion.
Sooty and Ruddy were the horses that took Kettricken and the Fool all the way form Buckkeep to the safety of the Mountain Kingdom when Regal crowned himself the King. Fitz met her there again. By this time she was carrying a foal by Ruddy despite her old age.
She later foaled a roan colt which together with Ruddy were give to Burrich to use as stud horses. Sooty herself was too old to make the journey back home.