Next airing Tue Apr 24, 6 p.m. ET

Up Sheep's Creek

Dr. Pol's next farm call requires him to take blood samples from a flock of sheep in order to test for OPP – Ovine Progressive Pneumonia, a progressive disease that is incurable and highly contagious. But it's not as easy as it sounds, Dr. Pol and Charles will have to wrestle the sheep before they can get the samples.