Sheep and goats and grazing animals need regular deworming medicines. The meds can be in a vaccine type shot and they can be given orally. The timing of the medicine is important. It is good to give the sheep worming meds in the spring before going to pasture and they can be wormed in the fall.
Worming sheep is done for many reasons. One of the reasons is that when it gets sick,this procedure is needed to keep the sheep from getting sick. Another reason,is that it is used to keep the sheep in tip top health.