In broad terms they would all run together in the paddock and probably you won't have any issues. At times I have horses, sheep, pigs and poultry in the field BUT not 24/7. You will need a pig shelter which the sheep will possibly go into, small sows grow into big sows you don't want her to stand on and injure your sheep. Feeding times will be a problem if they don't have separate areas and the sow will dig up here, there and everywhere. So, no as a 24/7 solution not recommended.